include/linux/mdio.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * linux/mdio.h: definitions for MDIO (clause 45) transceivers
   4  * Copyright 2006-2009 Solarflare Communications Inc.
   5  */
   6 #ifndef __LINUX_MDIO_H__
   7 #define __LINUX_MDIO_H__
   8
   9 #include <uapi/linux/mdio.h>
  10 #include <linux/mod_devicetable.h>
  11
  12 /* Or MII_ADDR_C45 into regnum for read/write on mii_bus to enable the 21 bit
  13  * IEEE 802.3ae clause 45 addressing mode used by 10GIGE phy chips.
  14  */
  15 #define MII_ADDR_C45            (1<<30)
  16 #define MII_DEVADDR_C45_SHIFT   16
  17 #define MII_REGADDR_C45_MASK    GENMASK(15, 0)
  18
  19 struct gpio_desc;
  20 struct mii_bus;
  21 struct reset_control;
  22
  23 /* Multiple levels of nesting are possible. However typically this is
  24  * limited to nested DSA like layer, a MUX layer, and the normal
  25  * user. Instead of trying to handle the general case, just define
  26  * these cases.
  27  */
  28 enum mdio_mutex_lock_class {
  29         MDIO_MUTEX_NORMAL,
  30         MDIO_MUTEX_MUX,
  31         MDIO_MUTEX_NESTED,
  32 };
  33
  34 struct mdio_device {
  35         struct device dev;
  36
  37         struct mii_bus *bus;
  38         char modalias[MDIO_NAME_SIZE];
  39
  40         int (*bus_match)(struct device *dev, struct device_driver *drv);
  41         void (*device_free)(struct mdio_device *mdiodev);
  42         void (*device_remove)(struct mdio_device *mdiodev);
  43
  44         /* Bus address of the MDIO device (0-31) */
  45         int addr;
  46         int flags;
  47         struct gpio_desc *reset_gpio;
  48         struct reset_control *reset_ctrl;
  49         unsigned int reset_assert_delay;
  50         unsigned int reset_deassert_delay;
  51 };
  52
  53 static inline struct mdio_device *to_mdio_device(const struct device *dev)
  54 {
  55         return container_of(dev, struct mdio_device, dev);
  56 }
  57
  58 /* struct mdio_driver_common: Common to all MDIO drivers */
  59 struct mdio_driver_common {
  60         struct device_driver driver;
  61         int flags;
  62 };
  63 #define MDIO_DEVICE_FLAG_PHY            1
  64
  65 static inline struct mdio_driver_common *
  66 to_mdio_common_driver(const struct device_driver *driver)
  67 {
  68         return container_of(driver, struct mdio_driver_common, driver);
  69 }
  70
  71 /* struct mdio_driver: Generic MDIO driver */
  72 struct mdio_driver {
  73         struct mdio_driver_common mdiodrv;
  74
  75         /*
  76          * Called during discovery.  Used to set
  77          * up device-specific structures, if any
  78          */
  79         int (*probe)(struct mdio_device *mdiodev);
  80
  81         /* Clears up any memory if needed */
  82         void (*remove)(struct mdio_device *mdiodev);
  83 };
  84
  85 static inline struct mdio_driver *
  86 to_mdio_driver(const struct device_driver *driver)
  87 {
  88         return container_of(to_mdio_common_driver(driver), struct mdio_driver,
  89                             mdiodrv);
  90 }
  91
  92 /* device driver data */
  93 static inline void mdiodev_set_drvdata(struct mdio_device *mdio, void *data)
  94 {
  95         dev_set_drvdata(&mdio->dev, data);
  96 }
  97
  98 static inline void *mdiodev_get_drvdata(struct mdio_device *mdio)
  99 {
 100         return dev_get_drvdata(&mdio->dev);
 101 }
 102
 103 void mdio_device_free(struct mdio_device *mdiodev);
 104 struct mdio_device *mdio_device_create(struct mii_bus *bus, int addr);
 105 int mdio_device_register(struct mdio_device *mdiodev);
 106 void mdio_device_remove(struct mdio_device *mdiodev);
 107 void mdio_device_reset(struct mdio_device *mdiodev, int value);
 108 int mdio_driver_register(struct mdio_driver *drv);
 109 void mdio_driver_unregister(struct mdio_driver *drv);
 110 int mdio_device_bus_match(struct device *dev, struct device_driver *drv);
 111
 112 static inline bool mdio_phy_id_is_c45(int phy_id)
 113 {
 114         return (phy_id & MDIO_PHY_ID_C45) && !(phy_id & ~MDIO_PHY_ID_C45_MASK);
 115 }
 116
 117 static inline __u16 mdio_phy_id_prtad(int phy_id)
 118 {
 119         return (phy_id & MDIO_PHY_ID_PRTAD) >> 5;
 120 }
 121
 122 static inline __u16 mdio_phy_id_devad(int phy_id)
 123 {
 124         return phy_id & MDIO_PHY_ID_DEVAD;
 125 }
 126
 127 /**
 128  * struct mdio_if_info - Ethernet controller MDIO interface
 129  * @prtad: PRTAD of the PHY (%MDIO_PRTAD_NONE if not present/unknown)
 130  * @mmds: Mask of MMDs expected to be present in the PHY.  This must be
 131  *      non-zero unless @prtad = %MDIO_PRTAD_NONE.
 132  * @mode_support: MDIO modes supported.  If %MDIO_SUPPORTS_C22 is set then
 133  *      MII register access will be passed through with @devad =
 134  *      %MDIO_DEVAD_NONE.  If %MDIO_EMULATE_C22 is set then access to
 135  *      commonly used clause 22 registers will be translated into
 136  *      clause 45 registers.
 137  * @dev: Net device structure
 138  * @mdio_read: Register read function; returns value or negative error code
 139  * @mdio_write: Register write function; returns 0 or negative error code
 140  */
 141 struct mdio_if_info {
 142         int prtad;
 143         u32 mmds;
 144         unsigned mode_support;
 145
 146         struct net_device *dev;
 147         int (*mdio_read)(struct net_device *dev, int prtad, int devad,
 148                          u16 addr);
 149         int (*mdio_write)(struct net_device *dev, int prtad, int devad,
 150                           u16 addr, u16 val);
 151 };
 152
 153 #define MDIO_PRTAD_NONE                 (-1)
 154 #define MDIO_DEVAD_NONE                 (-1)
 155 #define MDIO_SUPPORTS_C22               1
 156 #define MDIO_SUPPORTS_C45               2
 157 #define MDIO_EMULATE_C22                4
 158
 159 struct ethtool_cmd;
 160 struct ethtool_pauseparam;
 161 extern int mdio45_probe(struct mdio_if_info *mdio, int prtad);
 162 extern int mdio_set_flag(const struct mdio_if_info *mdio,
 163                          int prtad, int devad, u16 addr, int mask,
 164                          bool sense);
 165 extern int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmds);
 166 extern int mdio45_nway_restart(const struct mdio_if_info *mdio);
 167 extern void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
 168                                       struct ethtool_cmd *ecmd,
 169                                       u32 npage_adv, u32 npage_lpa);
 170 extern void
 171 mdio45_ethtool_ksettings_get_npage(const struct mdio_if_info *mdio,
 172                                    struct ethtool_link_ksettings *cmd,
 173                                    u32 npage_adv, u32 npage_lpa);
 174
 175 /**
 176  * mdio45_ethtool_gset - get settings for ETHTOOL_GSET
 177  * @mdio: MDIO interface
 178  * @ecmd: Ethtool request structure
 179  *
 180  * Since the CSRs for auto-negotiation using next pages are not fully
 181  * standardised, this function does not attempt to decode them.  Use
 182  * mdio45_ethtool_gset_npage() to specify advertisement bits from next
 183  * pages.
 184  */
 185 static inline void mdio45_ethtool_gset(const struct mdio_if_info *mdio,
 186                                        struct ethtool_cmd *ecmd)
 187 {
 188         mdio45_ethtool_gset_npage(mdio, ecmd, 0, 0);
 189 }
 190
 191 /**
 192  * mdio45_ethtool_ksettings_get - get settings for ETHTOOL_GLINKSETTINGS
 193  * @mdio: MDIO interface
 194  * @cmd: Ethtool request structure
 195  *
 196  * Since the CSRs for auto-negotiation using next pages are not fully
 197  * standardised, this function does not attempt to decode them.  Use
 198  * mdio45_ethtool_ksettings_get_npage() to specify advertisement bits
 199  * from next pages.
 200  */
 201 static inline void
 202 mdio45_ethtool_ksettings_get(const struct mdio_if_info *mdio,
 203                              struct ethtool_link_ksettings *cmd)
 204 {
 205         mdio45_ethtool_ksettings_get_npage(mdio, cmd, 0, 0);
 206 }
 207
 208 extern int mdio_mii_ioctl(const struct mdio_if_info *mdio,
 209                           struct mii_ioctl_data *mii_data, int cmd);
 210
 211 /**
 212  * mmd_eee_cap_to_ethtool_sup_t
 213  * @eee_cap: value of the MMD EEE Capability register
 214  *
 215  * A small helper function that translates MMD EEE Capability (3.20) bits
 216  * to ethtool supported settings.
 217  */
 218 static inline u32 mmd_eee_cap_to_ethtool_sup_t(u16 eee_cap)
 219 {
 220         u32 supported = 0;
 221
 222         if (eee_cap & MDIO_EEE_100TX)
 223                 supported |= SUPPORTED_100baseT_Full;
 224         if (eee_cap & MDIO_EEE_1000T)
 225                 supported |= SUPPORTED_1000baseT_Full;
 226         if (eee_cap & MDIO_EEE_10GT)
 227                 supported |= SUPPORTED_10000baseT_Full;
 228         if (eee_cap & MDIO_EEE_1000KX)
 229                 supported |= SUPPORTED_1000baseKX_Full;
 230         if (eee_cap & MDIO_EEE_10GKX4)
 231                 supported |= SUPPORTED_10000baseKX4_Full;
 232         if (eee_cap & MDIO_EEE_10GKR)
 233                 supported |= SUPPORTED_10000baseKR_Full;
 234
 235         return supported;
 236 }
 237
 238 /**
 239  * mmd_eee_adv_to_ethtool_adv_t
 240  * @eee_adv: value of the MMD EEE Advertisement/Link Partner Ability registers
 241  *
 242  * A small helper function that translates the MMD EEE Advertisment (7.60)
 243  * and MMD EEE Link Partner Ability (7.61) bits to ethtool advertisement
 244  * settings.
 245  */
 246 static inline u32 mmd_eee_adv_to_ethtool_adv_t(u16 eee_adv)
 247 {
 248         u32 adv = 0;
 249
 250         if (eee_adv & MDIO_EEE_100TX)
 251                 adv |= ADVERTISED_100baseT_Full;
 252         if (eee_adv & MDIO_EEE_1000T)
 253                 adv |= ADVERTISED_1000baseT_Full;
 254         if (eee_adv & MDIO_EEE_10GT)
 255                 adv |= ADVERTISED_10000baseT_Full;
 256         if (eee_adv & MDIO_EEE_1000KX)
 257                 adv |= ADVERTISED_1000baseKX_Full;
 258         if (eee_adv & MDIO_EEE_10GKX4)
 259                 adv |= ADVERTISED_10000baseKX4_Full;
 260         if (eee_adv & MDIO_EEE_10GKR)
 261                 adv |= ADVERTISED_10000baseKR_Full;
 262
 263         return adv;
 264 }
 265
 266 /**
 267  * ethtool_adv_to_mmd_eee_adv_t
 268  * @adv: the ethtool advertisement settings
 269  *
 270  * A small helper function that translates ethtool advertisement settings
 271  * to EEE advertisements for the MMD EEE Advertisement (7.60) and
 272  * MMD EEE Link Partner Ability (7.61) registers.
 273  */
 274 static inline u16 ethtool_adv_to_mmd_eee_adv_t(u32 adv)
 275 {
 276         u16 reg = 0;
 277
 278         if (adv & ADVERTISED_100baseT_Full)
 279                 reg |= MDIO_EEE_100TX;
 280         if (adv & ADVERTISED_1000baseT_Full)
 281                 reg |= MDIO_EEE_1000T;
 282         if (adv & ADVERTISED_10000baseT_Full)
 283                 reg |= MDIO_EEE_10GT;
 284         if (adv & ADVERTISED_1000baseKX_Full)
 285                 reg |= MDIO_EEE_1000KX;
 286         if (adv & ADVERTISED_10000baseKX4_Full)
 287                 reg |= MDIO_EEE_10GKX4;
 288         if (adv & ADVERTISED_10000baseKR_Full)
 289                 reg |= MDIO_EEE_10GKR;
 290
 291         return reg;
 292 }
 293
 294 /**
 295  * linkmode_adv_to_mii_10gbt_adv_t
 296  * @advertising: the linkmode advertisement settings
 297  *
 298  * A small helper function that translates linkmode advertisement
 299  * settings to phy autonegotiation advertisements for the C45
 300  * 10GBASE-T AN CONTROL (7.32) register.
 301  */
 302 static inline u32 linkmode_adv_to_mii_10gbt_adv_t(unsigned long *advertising)
 303 {
 304         u32 result = 0;
 305
 306         if (linkmode_test_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
 307                               advertising))
 308                 result |= MDIO_AN_10GBT_CTRL_ADV2_5G;
 309         if (linkmode_test_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT,
 310                               advertising))
 311                 result |= MDIO_AN_10GBT_CTRL_ADV5G;
 312         if (linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
 313                               advertising))
 314                 result |= MDIO_AN_10GBT_CTRL_ADV10G;
 315
 316         return result;
 317 }
 318
 319 /**
 320  * mii_10gbt_stat_mod_linkmode_lpa_t
 321  * @advertising: target the linkmode advertisement settings
 322  * @lpa: value of the C45 10GBASE-T AN STATUS register
 323  *
 324  * A small helper function that translates C45 10GBASE-T AN STATUS register bits
 325  * to linkmode advertisement settings. Other bits in advertising aren't changed.
 326  */
 327 static inline void mii_10gbt_stat_mod_linkmode_lpa_t(unsigned long *advertising,
 328                                                      u32 lpa)
 329 {
 330         linkmode_mod_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
 331                          advertising, lpa & MDIO_AN_10GBT_STAT_LP2_5G);
 332         linkmode_mod_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT,
 333                          advertising, lpa & MDIO_AN_10GBT_STAT_LP5G);
 334         linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
 335                          advertising, lpa & MDIO_AN_10GBT_STAT_LP10G);
 336 }
 337
 338 int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
 339 int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
 340 int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,
 341                              u16 mask, u16 set);
 342
 343 int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
 344 int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum);
 345 int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
 346 int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val);
 347 int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask,
 348                    u16 set);
 349
 350 static inline u32 mdiobus_c45_addr(int devad, u16 regnum)
 351 {
 352         return MII_ADDR_C45 | devad << MII_DEVADDR_C45_SHIFT | regnum;
 353 }
 354
 355 static inline int __mdiobus_c45_read(struct mii_bus *bus, int prtad, int devad,
 356                                      u16 regnum)
 357 {
 358         return __mdiobus_read(bus, prtad, mdiobus_c45_addr(devad, regnum));
 359 }
 360
 361 static inline int __mdiobus_c45_write(struct mii_bus *bus, int prtad, int devad,
 362                                       u16 regnum, u16 val)
 363 {
 364         return __mdiobus_write(bus, prtad, mdiobus_c45_addr(devad, regnum),
 365                                val);
 366 }
 367
 368 static inline int mdiobus_c45_read(struct mii_bus *bus, int prtad, int devad,
 369                                    u16 regnum)
 370 {
 371         return mdiobus_read(bus, prtad, mdiobus_c45_addr(devad, regnum));
 372 }
 373
 374 static inline int mdiobus_c45_write(struct mii_bus *bus, int prtad, int devad,
 375                                     u16 regnum, u16 val)
 376 {
 377         return mdiobus_write(bus, prtad, mdiobus_c45_addr(devad, regnum), val);
 378 }
 379
 380 int mdiobus_register_device(struct mdio_device *mdiodev);
 381 int mdiobus_unregister_device(struct mdio_device *mdiodev);
 382 bool mdiobus_is_registered_device(struct mii_bus *bus, int addr);
 383 struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr);
 384
 385 /**
 386  * mdio_module_driver() - Helper macro for registering mdio drivers
 387  * @_mdio_driver: driver to register
 388  *
 389  * Helper macro for MDIO drivers which do not do anything special in module
 390  * init/exit. Each module may only use this macro once, and calling it
 391  * replaces module_init() and module_exit().
 392  */
 393 #define mdio_module_driver(_mdio_driver)                                \
 394 static int __init mdio_module_init(void)                                \
 395 {                                                                       \
 396         return mdio_driver_register(&_mdio_driver);                     \
 397 }                                                                       \
 398 module_init(mdio_module_init);                                          \
 399 static void __exit mdio_module_exit(void)                               \
 400 {                                                                       \
 401         mdio_driver_unregister(&_mdio_driver);                          \
 402 }                                                                       \
 403 module_exit(mdio_module_exit)
 404
 405 #endif /* __LINUX_MDIO_H__ */