4 * Framework and drivers for configuring and reading different PHYs
5 * Based on code in sungem_phy.c and gianfar_phy.c
9 * Copyright (c) 2004 Freescale Semiconductor, Inc.
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.
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>
28 #include <asm/atomic.h>
30 #define PHY_BASIC_FEATURES (SUPPORTED_10baseT_Half | \
31 SUPPORTED_10baseT_Full | \
32 SUPPORTED_100baseT_Half | \
33 SUPPORTED_100baseT_Full | \
38 #define PHY_GBIT_FEATURES (PHY_BASIC_FEATURES | \
39 SUPPORTED_1000baseT_Half | \
40 SUPPORTED_1000baseT_Full)
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
48 #define PHY_IGNORE_INTERRUPT -2
50 #define PHY_HAS_INTERRUPT 0x00000001
51 #define PHY_HAS_MAGICANEG 0x00000002
53 /* Interface Mode definitions */
55 PHY_INTERFACE_MODE_MII,
56 PHY_INTERFACE_MODE_GMII,
57 PHY_INTERFACE_MODE_SGMII,
58 PHY_INTERFACE_MODE_TBI,
59 PHY_INTERFACE_MODE_RMII,
60 PHY_INTERFACE_MODE_RGMII,
61 PHY_INTERFACE_MODE_RGMII_ID,
62 PHY_INTERFACE_MODE_RGMII_RXID,
63 PHY_INTERFACE_MODE_RGMII_TXID,
64 PHY_INTERFACE_MODE_RTBI
68 #define PHY_INIT_TIMEOUT 100000
69 #define PHY_STATE_TIME 1
70 #define PHY_FORCE_TIMEOUT 10
71 #define PHY_AN_TIMEOUT 10
73 #define PHY_MAX_ADDR 32
75 /* Used when trying to connect to a specific phy (mii bus id:phy device id) */
76 #define PHY_ID_FMT "%s:%02x"
79 * Need to be a little smaller than phydev->dev.bus_id to leave room
82 #define MII_BUS_ID_SIZE (20 - 3)
84 /* Or MII_ADDR_C45 into regnum for read/write on mii_bus to enable the 21 bit
85 IEEE 802.3ae clause 45 addressing mode used by 10GIGE phy chips. */
86 #define MII_ADDR_C45 (1<<30)
89 * The Bus class for PHYs. Devices which provide access to
90 * PHYs should register using this structure
94 char id[MII_BUS_ID_SIZE];
96 int (*read)(struct mii_bus *bus, int phy_id, int regnum);
97 int (*write)(struct mii_bus *bus, int phy_id, int regnum, u16 val);
98 int (*reset)(struct mii_bus *bus);
101 * A lock to ensure that only one thing can read/write
102 * the MDIO bus at a time
104 struct mutex mdio_lock;
106 struct device *parent;
108 MDIOBUS_ALLOCATED = 1,
110 MDIOBUS_UNREGISTERED,
115 /* list of all PHYs on bus */
116 struct phy_device *phy_map[PHY_MAX_ADDR];
118 /* Phy addresses to be ignored when probing */
122 * Pointer to an array of interrupts, each PHY's
123 * interrupt at the index matching its address
127 #define to_mii_bus(d) container_of(d, struct mii_bus, dev)
129 struct mii_bus *mdiobus_alloc(void);
130 int mdiobus_register(struct mii_bus *bus);
131 void mdiobus_unregister(struct mii_bus *bus);
132 void mdiobus_free(struct mii_bus *bus);
133 struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr);
134 int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
135 int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
138 #define PHY_INTERRUPT_DISABLED 0x0
139 #define PHY_INTERRUPT_ENABLED 0x80000000
141 /* PHY state machine states:
143 * DOWN: PHY device and driver are not ready for anything. probe
144 * should be called if and only if the PHY is in this state,
145 * given that the PHY device exists.
146 * - PHY driver probe function will, depending on the PHY, set
147 * the state to STARTING or READY
149 * STARTING: PHY device is coming up, and the ethernet driver is
150 * not ready. PHY drivers may set this in the probe function.
151 * If they do, they are responsible for making sure the state is
152 * eventually set to indicate whether the PHY is UP or READY,
153 * depending on the state when the PHY is done starting up.
154 * - PHY driver will set the state to READY
155 * - start will set the state to PENDING
157 * READY: PHY is ready to send and receive packets, but the
158 * controller is not. By default, PHYs which do not implement
159 * probe will be set to this state by phy_probe(). If the PHY
160 * driver knows the PHY is ready, and the PHY state is STARTING,
161 * then it sets this STATE.
162 * - start will set the state to UP
164 * PENDING: PHY device is coming up, but the ethernet driver is
165 * ready. phy_start will set this state if the PHY state is
167 * - PHY driver will set the state to UP when the PHY is ready
169 * UP: The PHY and attached device are ready to do work.
170 * Interrupts should be started here.
171 * - timer moves to AN
173 * AN: The PHY is currently negotiating the link state. Link is
174 * therefore down for now. phy_timer will set this state when it
175 * detects the state is UP. config_aneg will set this state
176 * whenever called with phydev->autoneg set to AUTONEG_ENABLE.
177 * - If autonegotiation finishes, but there's no link, it sets
178 * the state to NOLINK.
179 * - If aneg finishes with link, it sets the state to RUNNING,
180 * and calls adjust_link
181 * - If autonegotiation did not finish after an arbitrary amount
182 * of time, autonegotiation should be tried again if the PHY
183 * supports "magic" autonegotiation (back to AN)
184 * - If it didn't finish, and no magic_aneg, move to FORCING.
186 * NOLINK: PHY is up, but not currently plugged in.
187 * - If the timer notes that the link comes back, we move to RUNNING
188 * - config_aneg moves to AN
189 * - phy_stop moves to HALTED
191 * FORCING: PHY is being configured with forced settings
192 * - if link is up, move to RUNNING
193 * - If link is down, we drop to the next highest setting, and
194 * retry (FORCING) after a timeout
195 * - phy_stop moves to HALTED
197 * RUNNING: PHY is currently up, running, and possibly sending
198 * and/or receiving packets
199 * - timer will set CHANGELINK if we're polling (this ensures the
200 * link state is polled every other cycle of this state machine,
201 * which makes it every other second)
202 * - irq will set CHANGELINK
203 * - config_aneg will set AN
204 * - phy_stop moves to HALTED
206 * CHANGELINK: PHY experienced a change in link state
207 * - timer moves to RUNNING if link
208 * - timer moves to NOLINK if the link is down
209 * - phy_stop moves to HALTED
211 * HALTED: PHY is up, but no polling or interrupts are done. Or
212 * PHY is in an error state.
214 * - phy_start moves to RESUMING
216 * RESUMING: PHY was halted, but now wants to run again.
217 * - If we are forcing, or aneg is done, timer moves to RUNNING
218 * - If aneg is not done, timer moves to AN
219 * - phy_stop moves to HALTED
236 /* phy_device: An instance of a PHY
238 * drv: Pointer to the driver for this PHY instance
239 * bus: Pointer to the bus this PHY is on
240 * dev: driver model device structure for this PHY
241 * phy_id: UID for this device found during discovery
242 * state: state of the PHY for management purposes
243 * dev_flags: Device-specific flags used by the PHY driver.
244 * addr: Bus address of PHY
245 * link_timeout: The number of timer firings to wait before the
246 * giving up on the current attempt at acquiring a link
247 * irq: IRQ number of the PHY's interrupt (-1 if none)
248 * phy_timer: The timer for handling the state machine
249 * phy_queue: A work_queue for the interrupt
250 * attached_dev: The attached enet driver's device instance ptr
251 * adjust_link: Callback for the enet controller to respond to
252 * changes in the link state.
253 * adjust_state: Callback for the enet driver to respond to
254 * changes in the state machine.
256 * speed, duplex, pause, supported, advertising, and
257 * autoneg are used like in mii_if_info
259 * interrupts currently only supports enabled or disabled,
260 * but could be changed in the future to support enabling
261 * and disabling specific interrupts
263 * Contains some infrastructure for polling and interrupt
264 * handling, as well as handling shifts in PHY hardware state
267 /* Information about the PHY type */
268 /* And management functions */
269 struct phy_driver *drv;
277 enum phy_state state;
281 phy_interface_t interface;
283 /* Bus address of the PHY (0-32) */
287 * forced speed & duplex (no autoneg)
288 * partner speed & duplex & pause (autoneg)
295 /* The most recently read link state */
298 /* Enabled Interrupts */
301 /* Union of PHY and Attached devices' supported modes */
302 /* See mii.h for more info */
311 * Interrupt number for this PHY
312 * -1 means no interrupt
316 /* private data pointer */
317 /* For use by PHYs to maintain extra state */
320 /* Interrupt and Polling infrastructure */
321 struct work_struct phy_queue;
322 struct delayed_work state_queue;
323 atomic_t irq_disable;
327 struct net_device *attached_dev;
329 void (*adjust_link)(struct net_device *dev);
331 void (*adjust_state)(struct net_device *dev);
333 #define to_phy_device(d) container_of(d, struct phy_device, dev)
335 /* struct phy_driver: Driver structure for a particular PHY type
337 * phy_id: The result of reading the UID registers of this PHY
338 * type, and ANDing them with the phy_id_mask. This driver
339 * only works for PHYs with IDs which match this field
340 * name: The friendly name of this PHY type
341 * phy_id_mask: Defines the important bits of the phy_id
342 * features: A list of features (speed, duplex, etc) supported
344 * flags: A bitfield defining certain other features this PHY
345 * supports (like interrupts)
347 * The drivers must implement config_aneg and read_status. All
348 * other functions are optional. Note that none of these
349 * functions should be called from interrupt time. The goal is
350 * for the bus read/write functions to be able to block when the
351 * bus transaction is happening, and be freed up by an interrupt
352 * (The MPC85xx has this ability, though it is not currently
353 * supported in the driver).
358 unsigned int phy_id_mask;
363 * Called to initialize the PHY,
364 * including after a reset
366 int (*config_init)(struct phy_device *phydev);
369 * Called during discovery. Used to set
370 * up device-specific structures, if any
372 int (*probe)(struct phy_device *phydev);
374 /* PHY Power Management */
375 int (*suspend)(struct phy_device *phydev);
376 int (*resume)(struct phy_device *phydev);
379 * Configures the advertisement and resets
380 * autonegotiation if phydev->autoneg is on,
381 * forces the speed to the current settings in phydev
382 * if phydev->autoneg is off
384 int (*config_aneg)(struct phy_device *phydev);
386 /* Determines the negotiated speed and duplex */
387 int (*read_status)(struct phy_device *phydev);
389 /* Clears any pending interrupts */
390 int (*ack_interrupt)(struct phy_device *phydev);
392 /* Enables or disables interrupts */
393 int (*config_intr)(struct phy_device *phydev);
396 * Checks if the PHY generated an interrupt.
397 * For multi-PHY devices with shared PHY interrupt pin
399 int (*did_interrupt)(struct phy_device *phydev);
401 /* Clears up any memory if needed */
402 void (*remove)(struct phy_device *phydev);
404 struct device_driver driver;
406 #define to_phy_driver(d) container_of(d, struct phy_driver, driver)
408 #define PHY_ANY_ID "MATCH ANY PHY"
409 #define PHY_ANY_UID 0xffffffff
411 /* A Structure for boards to register fixups with the PHY Lib */
413 struct list_head list;
417 int (*run)(struct phy_device *phydev);
421 * phy_read - Convenience function for reading a given PHY register
422 * @phydev: the phy_device struct
423 * @regnum: register number to read
425 * NOTE: MUST NOT be called from interrupt context,
426 * because the bus read/write functions may wait for an interrupt
427 * to conclude the operation.
429 static inline int phy_read(struct phy_device *phydev, u32 regnum)
431 return mdiobus_read(phydev->bus, phydev->addr, regnum);
435 * phy_write - Convenience function for writing a given PHY register
436 * @phydev: the phy_device struct
437 * @regnum: register number to write
438 * @val: value to write to @regnum
440 * NOTE: MUST NOT be called from interrupt context,
441 * because the bus read/write functions may wait for an interrupt
442 * to conclude the operation.
444 static inline int phy_write(struct phy_device *phydev, u32 regnum, u16 val)
446 return mdiobus_write(phydev->bus, phydev->addr, regnum, val);
449 int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id);
450 struct phy_device* get_phy_device(struct mii_bus *bus, int addr);
451 int phy_device_register(struct phy_device *phy);
452 int phy_clear_interrupt(struct phy_device *phydev);
453 int phy_config_interrupt(struct phy_device *phydev, u32 interrupts);
454 int phy_init_hw(struct phy_device *phydev);
455 int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
456 u32 flags, phy_interface_t interface);
457 struct phy_device * phy_attach(struct net_device *dev,
458 const char *bus_id, u32 flags, phy_interface_t interface);
459 struct phy_device *phy_find_first(struct mii_bus *bus);
460 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
461 void (*handler)(struct net_device *), u32 flags,
462 phy_interface_t interface);
463 struct phy_device * phy_connect(struct net_device *dev, const char *bus_id,
464 void (*handler)(struct net_device *), u32 flags,
465 phy_interface_t interface);
466 void phy_disconnect(struct phy_device *phydev);
467 void phy_detach(struct phy_device *phydev);
468 void phy_start(struct phy_device *phydev);
469 void phy_stop(struct phy_device *phydev);
470 int phy_start_aneg(struct phy_device *phydev);
472 void phy_sanitize_settings(struct phy_device *phydev);
473 int phy_stop_interrupts(struct phy_device *phydev);
474 int phy_enable_interrupts(struct phy_device *phydev);
475 int phy_disable_interrupts(struct phy_device *phydev);
477 static inline int phy_read_status(struct phy_device *phydev) {
478 return phydev->drv->read_status(phydev);
481 int genphy_config_advert(struct phy_device *phydev);
482 int genphy_setup_forced(struct phy_device *phydev);
483 int genphy_restart_aneg(struct phy_device *phydev);
484 int genphy_config_aneg(struct phy_device *phydev);
485 int genphy_update_link(struct phy_device *phydev);
486 int genphy_read_status(struct phy_device *phydev);
487 int genphy_suspend(struct phy_device *phydev);
488 int genphy_resume(struct phy_device *phydev);
489 void phy_driver_unregister(struct phy_driver *drv);
490 int phy_driver_register(struct phy_driver *new_driver);
491 void phy_prepare_link(struct phy_device *phydev,
492 void (*adjust_link)(struct net_device *));
493 void phy_state_machine(struct work_struct *work);
494 void phy_start_machine(struct phy_device *phydev,
495 void (*handler)(struct net_device *));
496 void phy_stop_machine(struct phy_device *phydev);
497 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd);
498 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd);
499 int phy_mii_ioctl(struct phy_device *phydev,
500 struct mii_ioctl_data *mii_data, int cmd);
501 int phy_start_interrupts(struct phy_device *phydev);
502 void phy_print_status(struct phy_device *phydev);
503 struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id);
504 void phy_device_free(struct phy_device *phydev);
506 int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
507 int (*run)(struct phy_device *));
508 int phy_register_fixup_for_id(const char *bus_id,
509 int (*run)(struct phy_device *));
510 int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
511 int (*run)(struct phy_device *));
512 int phy_scan_fixups(struct phy_device *phydev);
514 int __init mdio_bus_init(void);
515 void mdio_bus_exit(void);
517 extern struct bus_type mdio_bus_type;