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);
mdiobus_alloc(void)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  */
phy_read(struct phy_device * phydev,u32 regnum)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  */
phy_write(struct phy_device * phydev,u32 regnum,u16 val)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 
phy_read_status(struct phy_device * phydev)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 */
538