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 #include <asm/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 /* Set phydev->irq to PHY_POLL if interrupts are not supported, 43 * or not desired for this PHY. Set to PHY_IGNORE_INTERRUPT if 44 * the attached driver handles the interrupt 45 */ 46 #define PHY_POLL -1 47 #define PHY_IGNORE_INTERRUPT -2 48 49 #define PHY_HAS_INTERRUPT 0x00000001 50 #define PHY_HAS_MAGICANEG 0x00000002 51 52 /* Interface Mode definitions */ 53 typedef enum { 54 PHY_INTERFACE_MODE_MII, 55 PHY_INTERFACE_MODE_GMII, 56 PHY_INTERFACE_MODE_SGMII, 57 PHY_INTERFACE_MODE_TBI, 58 PHY_INTERFACE_MODE_RMII, 59 PHY_INTERFACE_MODE_RGMII, 60 PHY_INTERFACE_MODE_RGMII_ID, 61 PHY_INTERFACE_MODE_RGMII_RXID, 62 PHY_INTERFACE_MODE_RGMII_TXID, 63 PHY_INTERFACE_MODE_RTBI 64 } phy_interface_t; 65 66 #define MII_BUS_MAX 4 67 68 69 #define PHY_INIT_TIMEOUT 100000 70 #define PHY_STATE_TIME 1 71 #define PHY_FORCE_TIMEOUT 10 72 #define PHY_AN_TIMEOUT 10 73 74 #define PHY_MAX_ADDR 32 75 76 /* Used when trying to connect to a specific phy (mii bus id:phy device id) */ 77 #define PHY_ID_FMT "%x:%02x" 78 79 /* The Bus class for PHYs. Devices which provide access to 80 * PHYs should register using this structure */ 81 struct mii_bus { 82 const char *name; 83 int id; 84 void *priv; 85 int (*read)(struct mii_bus *bus, int phy_id, int regnum); 86 int (*write)(struct mii_bus *bus, int phy_id, int regnum, u16 val); 87 int (*reset)(struct mii_bus *bus); 88 89 /* A lock to ensure that only one thing can read/write 90 * the MDIO bus at a time */ 91 struct mutex mdio_lock; 92 93 struct device *dev; 94 95 /* list of all PHYs on bus */ 96 struct phy_device *phy_map[PHY_MAX_ADDR]; 97 98 /* Phy addresses to be ignored when probing */ 99 u32 phy_mask; 100 101 /* Pointer to an array of interrupts, each PHY's 102 * interrupt at the index matching its address */ 103 int *irq; 104 }; 105 106 #define PHY_INTERRUPT_DISABLED 0x0 107 #define PHY_INTERRUPT_ENABLED 0x80000000 108 109 /* PHY state machine states: 110 * 111 * DOWN: PHY device and driver are not ready for anything. probe 112 * should be called if and only if the PHY is in this state, 113 * given that the PHY device exists. 114 * - PHY driver probe function will, depending on the PHY, set 115 * the state to STARTING or READY 116 * 117 * STARTING: PHY device is coming up, and the ethernet driver is 118 * not ready. PHY drivers may set this in the probe function. 119 * If they do, they are responsible for making sure the state is 120 * eventually set to indicate whether the PHY is UP or READY, 121 * depending on the state when the PHY is done starting up. 122 * - PHY driver will set the state to READY 123 * - start will set the state to PENDING 124 * 125 * READY: PHY is ready to send and receive packets, but the 126 * controller is not. By default, PHYs which do not implement 127 * probe will be set to this state by phy_probe(). If the PHY 128 * driver knows the PHY is ready, and the PHY state is STARTING, 129 * then it sets this STATE. 130 * - start will set the state to UP 131 * 132 * PENDING: PHY device is coming up, but the ethernet driver is 133 * ready. phy_start will set this state if the PHY state is 134 * STARTING. 135 * - PHY driver will set the state to UP when the PHY is ready 136 * 137 * UP: The PHY and attached device are ready to do work. 138 * Interrupts should be started here. 139 * - timer moves to AN 140 * 141 * AN: The PHY is currently negotiating the link state. Link is 142 * therefore down for now. phy_timer will set this state when it 143 * detects the state is UP. config_aneg will set this state 144 * whenever called with phydev->autoneg set to AUTONEG_ENABLE. 145 * - If autonegotiation finishes, but there's no link, it sets 146 * the state to NOLINK. 147 * - If aneg finishes with link, it sets the state to RUNNING, 148 * and calls adjust_link 149 * - If autonegotiation did not finish after an arbitrary amount 150 * of time, autonegotiation should be tried again if the PHY 151 * supports "magic" autonegotiation (back to AN) 152 * - If it didn't finish, and no magic_aneg, move to FORCING. 153 * 154 * NOLINK: PHY is up, but not currently plugged in. 155 * - If the timer notes that the link comes back, we move to RUNNING 156 * - config_aneg moves to AN 157 * - phy_stop moves to HALTED 158 * 159 * FORCING: PHY is being configured with forced settings 160 * - if link is up, move to RUNNING 161 * - If link is down, we drop to the next highest setting, and 162 * retry (FORCING) after a timeout 163 * - phy_stop moves to HALTED 164 * 165 * RUNNING: PHY is currently up, running, and possibly sending 166 * and/or receiving packets 167 * - timer will set CHANGELINK if we're polling (this ensures the 168 * link state is polled every other cycle of this state machine, 169 * which makes it every other second) 170 * - irq will set CHANGELINK 171 * - config_aneg will set AN 172 * - phy_stop moves to HALTED 173 * 174 * CHANGELINK: PHY experienced a change in link state 175 * - timer moves to RUNNING if link 176 * - timer moves to NOLINK if the link is down 177 * - phy_stop moves to HALTED 178 * 179 * HALTED: PHY is up, but no polling or interrupts are done. Or 180 * PHY is in an error state. 181 * 182 * - phy_start moves to RESUMING 183 * 184 * RESUMING: PHY was halted, but now wants to run again. 185 * - If we are forcing, or aneg is done, timer moves to RUNNING 186 * - If aneg is not done, timer moves to AN 187 * - phy_stop moves to HALTED 188 */ 189 enum phy_state { 190 PHY_DOWN=0, 191 PHY_STARTING, 192 PHY_READY, 193 PHY_PENDING, 194 PHY_UP, 195 PHY_AN, 196 PHY_RUNNING, 197 PHY_NOLINK, 198 PHY_FORCING, 199 PHY_CHANGELINK, 200 PHY_HALTED, 201 PHY_RESUMING 202 }; 203 204 /* phy_device: An instance of a PHY 205 * 206 * drv: Pointer to the driver for this PHY instance 207 * bus: Pointer to the bus this PHY is on 208 * dev: driver model device structure for this PHY 209 * phy_id: UID for this device found during discovery 210 * state: state of the PHY for management purposes 211 * dev_flags: Device-specific flags used by the PHY driver. 212 * addr: Bus address of PHY 213 * link_timeout: The number of timer firings to wait before the 214 * giving up on the current attempt at acquiring a link 215 * irq: IRQ number of the PHY's interrupt (-1 if none) 216 * phy_timer: The timer for handling the state machine 217 * phy_queue: A work_queue for the interrupt 218 * attached_dev: The attached enet driver's device instance ptr 219 * adjust_link: Callback for the enet controller to respond to 220 * changes in the link state. 221 * adjust_state: Callback for the enet driver to respond to 222 * changes in the state machine. 223 * 224 * speed, duplex, pause, supported, advertising, and 225 * autoneg are used like in mii_if_info 226 * 227 * interrupts currently only supports enabled or disabled, 228 * but could be changed in the future to support enabling 229 * and disabling specific interrupts 230 * 231 * Contains some infrastructure for polling and interrupt 232 * handling, as well as handling shifts in PHY hardware state 233 */ 234 struct phy_device { 235 /* Information about the PHY type */ 236 /* And management functions */ 237 struct phy_driver *drv; 238 239 struct mii_bus *bus; 240 241 struct device dev; 242 243 u32 phy_id; 244 245 enum phy_state state; 246 247 u32 dev_flags; 248 249 phy_interface_t interface; 250 251 /* Bus address of the PHY (0-32) */ 252 int addr; 253 254 /* forced speed & duplex (no autoneg) 255 * partner speed & duplex & pause (autoneg) 256 */ 257 int speed; 258 int duplex; 259 int pause; 260 int asym_pause; 261 262 /* The most recently read link state */ 263 int link; 264 265 /* Enabled Interrupts */ 266 u32 interrupts; 267 268 /* Union of PHY and Attached devices' supported modes */ 269 /* See mii.h for more info */ 270 u32 supported; 271 u32 advertising; 272 273 int autoneg; 274 275 int link_timeout; 276 277 /* Interrupt number for this PHY 278 * -1 means no interrupt */ 279 int irq; 280 281 /* private data pointer */ 282 /* For use by PHYs to maintain extra state */ 283 void *priv; 284 285 /* Interrupt and Polling infrastructure */ 286 struct work_struct phy_queue; 287 struct work_struct state_queue; 288 struct timer_list phy_timer; 289 atomic_t irq_disable; 290 291 struct mutex lock; 292 293 struct net_device *attached_dev; 294 295 void (*adjust_link)(struct net_device *dev); 296 297 void (*adjust_state)(struct net_device *dev); 298 }; 299 #define to_phy_device(d) container_of(d, struct phy_device, dev) 300 301 /* struct phy_driver: Driver structure for a particular PHY type 302 * 303 * phy_id: The result of reading the UID registers of this PHY 304 * type, and ANDing them with the phy_id_mask. This driver 305 * only works for PHYs with IDs which match this field 306 * name: The friendly name of this PHY type 307 * phy_id_mask: Defines the important bits of the phy_id 308 * features: A list of features (speed, duplex, etc) supported 309 * by this PHY 310 * flags: A bitfield defining certain other features this PHY 311 * supports (like interrupts) 312 * 313 * The drivers must implement config_aneg and read_status. All 314 * other functions are optional. Note that none of these 315 * functions should be called from interrupt time. The goal is 316 * for the bus read/write functions to be able to block when the 317 * bus transaction is happening, and be freed up by an interrupt 318 * (The MPC85xx has this ability, though it is not currently 319 * supported in the driver). 320 */ 321 struct phy_driver { 322 u32 phy_id; 323 char *name; 324 unsigned int phy_id_mask; 325 u32 features; 326 u32 flags; 327 328 /* Called to initialize the PHY, 329 * including after a reset */ 330 int (*config_init)(struct phy_device *phydev); 331 332 /* Called during discovery. Used to set 333 * up device-specific structures, if any */ 334 int (*probe)(struct phy_device *phydev); 335 336 /* PHY Power Management */ 337 int (*suspend)(struct phy_device *phydev); 338 int (*resume)(struct phy_device *phydev); 339 340 /* Configures the advertisement and resets 341 * autonegotiation if phydev->autoneg is on, 342 * forces the speed to the current settings in phydev 343 * if phydev->autoneg is off */ 344 int (*config_aneg)(struct phy_device *phydev); 345 346 /* Determines the negotiated speed and duplex */ 347 int (*read_status)(struct phy_device *phydev); 348 349 /* Clears any pending interrupts */ 350 int (*ack_interrupt)(struct phy_device *phydev); 351 352 /* Enables or disables interrupts */ 353 int (*config_intr)(struct phy_device *phydev); 354 355 /* Clears up any memory if needed */ 356 void (*remove)(struct phy_device *phydev); 357 358 struct device_driver driver; 359 }; 360 #define to_phy_driver(d) container_of(d, struct phy_driver, driver) 361 362 int phy_read(struct phy_device *phydev, u16 regnum); 363 int phy_write(struct phy_device *phydev, u16 regnum, u16 val); 364 struct phy_device* get_phy_device(struct mii_bus *bus, int addr); 365 int phy_clear_interrupt(struct phy_device *phydev); 366 int phy_config_interrupt(struct phy_device *phydev, u32 interrupts); 367 struct phy_device * phy_attach(struct net_device *dev, 368 const char *phy_id, u32 flags, phy_interface_t interface); 369 struct phy_device * phy_connect(struct net_device *dev, const char *phy_id, 370 void (*handler)(struct net_device *), u32 flags, 371 phy_interface_t interface); 372 void phy_disconnect(struct phy_device *phydev); 373 void phy_detach(struct phy_device *phydev); 374 void phy_start(struct phy_device *phydev); 375 void phy_stop(struct phy_device *phydev); 376 int phy_start_aneg(struct phy_device *phydev); 377 378 int mdiobus_register(struct mii_bus *bus); 379 void mdiobus_unregister(struct mii_bus *bus); 380 void phy_sanitize_settings(struct phy_device *phydev); 381 int phy_stop_interrupts(struct phy_device *phydev); 382 383 static inline int phy_read_status(struct phy_device *phydev) { 384 return phydev->drv->read_status(phydev); 385 } 386 387 int genphy_config_advert(struct phy_device *phydev); 388 int genphy_setup_forced(struct phy_device *phydev); 389 int genphy_restart_aneg(struct phy_device *phydev); 390 int genphy_config_aneg(struct phy_device *phydev); 391 int genphy_update_link(struct phy_device *phydev); 392 int genphy_read_status(struct phy_device *phydev); 393 void phy_driver_unregister(struct phy_driver *drv); 394 int phy_driver_register(struct phy_driver *new_driver); 395 void phy_prepare_link(struct phy_device *phydev, 396 void (*adjust_link)(struct net_device *)); 397 void phy_start_machine(struct phy_device *phydev, 398 void (*handler)(struct net_device *)); 399 void phy_stop_machine(struct phy_device *phydev); 400 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd); 401 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd); 402 int phy_mii_ioctl(struct phy_device *phydev, 403 struct mii_ioctl_data *mii_data, int cmd); 404 int phy_start_interrupts(struct phy_device *phydev); 405 void phy_print_status(struct phy_device *phydev); 406 struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id); 407 void phy_device_free(struct phy_device *phydev); 408 409 extern struct bus_type mdio_bus_type; 410 #endif /* __PHY_H */ 411