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         /* Quiesces the device on system shutdown, turns off interrupts etc */
  85         void (*shutdown)(struct mdio_device *mdiodev);
  86 };
  87
  88 static inline struct mdio_driver *
  89 to_mdio_driver(const struct device_driver *driver)
  90 {
  91         return container_of(to_mdio_common_driver(driver), struct mdio_driver,
  92                             mdiodrv);
  93 }
  94
  95 /* device driver data */
  96 static inline void mdiodev_set_drvdata(struct mdio_device *mdio, void *data)
  97 {
  98         dev_set_drvdata(&mdio->dev, data);
  99 }
 100
 101 static inline void *mdiodev_get_drvdata(struct mdio_device *mdio)
 102 {
 103         return dev_get_drvdata(&mdio->dev);
 104 }
 105
 106 void mdio_device_free(struct mdio_device *mdiodev);
 107 struct mdio_device *mdio_device_create(struct mii_bus *bus, int addr);
 108 int mdio_device_register(struct mdio_device *mdiodev);
 109 void mdio_device_remove(struct mdio_device *mdiodev);
 110 void mdio_device_reset(struct mdio_device *mdiodev, int value);
 111 int mdio_driver_register(struct mdio_driver *drv);
 112 void mdio_driver_unregister(struct mdio_driver *drv);
 113 int mdio_device_bus_match(struct device *dev, struct device_driver *drv);
 114
 115 static inline bool mdio_phy_id_is_c45(int phy_id)
 116 {
 117         return (phy_id & MDIO_PHY_ID_C45) && !(phy_id & ~MDIO_PHY_ID_C45_MASK);
 118 }
 119
 120 static inline __u16 mdio_phy_id_prtad(int phy_id)
 121 {
 122         return (phy_id & MDIO_PHY_ID_PRTAD) >> 5;
 123 }
 124
 125 static inline __u16 mdio_phy_id_devad(int phy_id)
 126 {
 127         return phy_id & MDIO_PHY_ID_DEVAD;
 128 }
 129
 130 /**
 131  * struct mdio_if_info - Ethernet controller MDIO interface
 132  * @prtad: PRTAD of the PHY (%MDIO_PRTAD_NONE if not present/unknown)
 133  * @mmds: Mask of MMDs expected to be present in the PHY.  This must be
 134  *      non-zero unless @prtad = %MDIO_PRTAD_NONE.
 135  * @mode_support: MDIO modes supported.  If %MDIO_SUPPORTS_C22 is set then
 136  *      MII register access will be passed through with @devad =
 137  *      %MDIO_DEVAD_NONE.  If %MDIO_EMULATE_C22 is set then access to
 138  *      commonly used clause 22 registers will be translated into
 139  *      clause 45 registers.
 140  * @dev: Net device structure
 141  * @mdio_read: Register read function; returns value or negative error code
 142  * @mdio_write: Register write function; returns 0 or negative error code
 143  */
 144 struct mdio_if_info {
 145         int prtad;
 146         u32 mmds;
 147         unsigned mode_support;
 148
 149         struct net_device *dev;
 150         int (*mdio_read)(struct net_device *dev, int prtad, int devad,
 151                          u16 addr);
 152         int (*mdio_write)(struct net_device *dev, int prtad, int devad,
 153                           u16 addr, u16 val);
 154 };
 155
 156 #define MDIO_PRTAD_NONE                 (-1)
 157 #define MDIO_DEVAD_NONE                 (-1)
 158 #define MDIO_SUPPORTS_C22               1
 159 #define MDIO_SUPPORTS_C45               2
 160 #define MDIO_EMULATE_C22                4
 161
 162 struct ethtool_cmd;
 163 struct ethtool_pauseparam;
 164 extern int mdio45_probe(struct mdio_if_info *mdio, int prtad);
 165 extern int mdio_set_flag(const struct mdio_if_info *mdio,
 166                          int prtad, int devad, u16 addr, int mask,
 167                          bool sense);
 168 extern int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmds);
 169 extern int mdio45_nway_restart(const struct mdio_if_info *mdio);
 170 extern void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
 171                                       struct ethtool_cmd *ecmd,
 172                                       u32 npage_adv, u32 npage_lpa);
 173 extern void
 174 mdio45_ethtool_ksettings_get_npage(const struct mdio_if_info *mdio,
 175                                    struct ethtool_link_ksettings *cmd,
 176                                    u32 npage_adv, u32 npage_lpa);
 177
 178 /**
 179  * mdio45_ethtool_gset - get settings for ETHTOOL_GSET
 180  * @mdio: MDIO interface
 181  * @ecmd: Ethtool request structure
 182  *
 183  * Since the CSRs for auto-negotiation using next pages are not fully
 184  * standardised, this function does not attempt to decode them.  Use
 185  * mdio45_ethtool_gset_npage() to specify advertisement bits from next
 186  * pages.
 187  */
 188 static inline void mdio45_ethtool_gset(const struct mdio_if_info *mdio,
 189                                        struct ethtool_cmd *ecmd)
 190 {
 191         mdio45_ethtool_gset_npage(mdio, ecmd, 0, 0);
 192 }
 193
 194 /**
 195  * mdio45_ethtool_ksettings_get - get settings for ETHTOOL_GLINKSETTINGS
 196  * @mdio: MDIO interface
 197  * @cmd: Ethtool request structure
 198  *
 199  * Since the CSRs for auto-negotiation using next pages are not fully
 200  * standardised, this function does not attempt to decode them.  Use
 201  * mdio45_ethtool_ksettings_get_npage() to specify advertisement bits
 202  * from next pages.
 203  */
 204 static inline void
 205 mdio45_ethtool_ksettings_get(const struct mdio_if_info *mdio,
 206                              struct ethtool_link_ksettings *cmd)
 207 {
 208         mdio45_ethtool_ksettings_get_npage(mdio, cmd, 0, 0);
 209 }
 210
 211 extern int mdio_mii_ioctl(const struct mdio_if_info *mdio,
 212                           struct mii_ioctl_data *mii_data, int cmd);
 213
 214 /**
 215  * mmd_eee_cap_to_ethtool_sup_t
 216  * @eee_cap: value of the MMD EEE Capability register
 217  *
 218  * A small helper function that translates MMD EEE Capability (3.20) bits
 219  * to ethtool supported settings.
 220  */
 221 static inline u32 mmd_eee_cap_to_ethtool_sup_t(u16 eee_cap)
 222 {
 223         u32 supported = 0;
 224
 225         if (eee_cap & MDIO_EEE_100TX)
 226                 supported |= SUPPORTED_100baseT_Full;
 227         if (eee_cap & MDIO_EEE_1000T)
 228                 supported |= SUPPORTED_1000baseT_Full;
 229         if (eee_cap & MDIO_EEE_10GT)
 230                 supported |= SUPPORTED_10000baseT_Full;
 231         if (eee_cap & MDIO_EEE_1000KX)
 232                 supported |= SUPPORTED_1000baseKX_Full;
 233         if (eee_cap & MDIO_EEE_10GKX4)
 234                 supported |= SUPPORTED_10000baseKX4_Full;
 235         if (eee_cap & MDIO_EEE_10GKR)
 236                 supported |= SUPPORTED_10000baseKR_Full;
 237
 238         return supported;
 239 }
 240
 241 /**
 242  * mmd_eee_adv_to_ethtool_adv_t
 243  * @eee_adv: value of the MMD EEE Advertisement/Link Partner Ability registers
 244  *
 245  * A small helper function that translates the MMD EEE Advertisment (7.60)
 246  * and MMD EEE Link Partner Ability (7.61) bits to ethtool advertisement
 247  * settings.
 248  */
 249 static inline u32 mmd_eee_adv_to_ethtool_adv_t(u16 eee_adv)
 250 {
 251         u32 adv = 0;
 252
 253         if (eee_adv & MDIO_EEE_100TX)
 254                 adv |= ADVERTISED_100baseT_Full;
 255         if (eee_adv & MDIO_EEE_1000T)
 256                 adv |= ADVERTISED_1000baseT_Full;
 257         if (eee_adv & MDIO_EEE_10GT)
 258                 adv |= ADVERTISED_10000baseT_Full;
 259         if (eee_adv & MDIO_EEE_1000KX)
 260                 adv |= ADVERTISED_1000baseKX_Full;
 261         if (eee_adv & MDIO_EEE_10GKX4)
 262                 adv |= ADVERTISED_10000baseKX4_Full;
 263         if (eee_adv & MDIO_EEE_10GKR)
 264                 adv |= ADVERTISED_10000baseKR_Full;
 265
 266         return adv;
 267 }
 268
 269 /**
 270  * ethtool_adv_to_mmd_eee_adv_t
 271  * @adv: the ethtool advertisement settings
 272  *
 273  * A small helper function that translates ethtool advertisement settings
 274  * to EEE advertisements for the MMD EEE Advertisement (7.60) and
 275  * MMD EEE Link Partner Ability (7.61) registers.
 276  */
 277 static inline u16 ethtool_adv_to_mmd_eee_adv_t(u32 adv)
 278 {
 279         u16 reg = 0;
 280
 281         if (adv & ADVERTISED_100baseT_Full)
 282                 reg |= MDIO_EEE_100TX;
 283         if (adv & ADVERTISED_1000baseT_Full)
 284                 reg |= MDIO_EEE_1000T;
 285         if (adv & ADVERTISED_10000baseT_Full)
 286                 reg |= MDIO_EEE_10GT;
 287         if (adv & ADVERTISED_1000baseKX_Full)
 288                 reg |= MDIO_EEE_1000KX;
 289         if (adv & ADVERTISED_10000baseKX4_Full)
 290                 reg |= MDIO_EEE_10GKX4;
 291         if (adv & ADVERTISED_10000baseKR_Full)
 292                 reg |= MDIO_EEE_10GKR;
 293
 294         return reg;
 295 }
 296
 297 /**
 298  * linkmode_adv_to_mii_10gbt_adv_t
 299  * @advertising: the linkmode advertisement settings
 300  *
 301  * A small helper function that translates linkmode advertisement
 302  * settings to phy autonegotiation advertisements for the C45
 303  * 10GBASE-T AN CONTROL (7.32) register.
 304  */
 305 static inline u32 linkmode_adv_to_mii_10gbt_adv_t(unsigned long *advertising)
 306 {
 307         u32 result = 0;
 308
 309         if (linkmode_test_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
 310                               advertising))
 311                 result |= MDIO_AN_10GBT_CTRL_ADV2_5G;
 312         if (linkmode_test_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT,
 313                               advertising))
 314                 result |= MDIO_AN_10GBT_CTRL_ADV5G;
 315         if (linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
 316                               advertising))
 317                 result |= MDIO_AN_10GBT_CTRL_ADV10G;
 318
 319         return result;
 320 }
 321
 322 /**
 323  * mii_10gbt_stat_mod_linkmode_lpa_t
 324  * @advertising: target the linkmode advertisement settings
 325  * @lpa: value of the C45 10GBASE-T AN STATUS register
 326  *
 327  * A small helper function that translates C45 10GBASE-T AN STATUS register bits
 328  * to linkmode advertisement settings. Other bits in advertising aren't changed.
 329  */
 330 static inline void mii_10gbt_stat_mod_linkmode_lpa_t(unsigned long *advertising,
 331                                                      u32 lpa)
 332 {
 333         linkmode_mod_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
 334                          advertising, lpa & MDIO_AN_10GBT_STAT_LP2_5G);
 335         linkmode_mod_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT,
 336                          advertising, lpa & MDIO_AN_10GBT_STAT_LP5G);
 337         linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
 338                          advertising, lpa & MDIO_AN_10GBT_STAT_LP10G);
 339 }
 340
 341 int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
 342 int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
 343 int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,
 344                              u16 mask, u16 set);
 345
 346 int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
 347 int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum);
 348 int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
 349 int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val);
 350 int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask,
 351                    u16 set);
 352
 353 static inline u32 mdiobus_c45_addr(int devad, u16 regnum)
 354 {
 355         return MII_ADDR_C45 | devad << MII_DEVADDR_C45_SHIFT | regnum;
 356 }
 357
 358 static inline int __mdiobus_c45_read(struct mii_bus *bus, int prtad, int devad,
 359                                      u16 regnum)
 360 {
 361         return __mdiobus_read(bus, prtad, mdiobus_c45_addr(devad, regnum));
 362 }
 363
 364 static inline int __mdiobus_c45_write(struct mii_bus *bus, int prtad, int devad,
 365                                       u16 regnum, u16 val)
 366 {
 367         return __mdiobus_write(bus, prtad, mdiobus_c45_addr(devad, regnum),
 368                                val);
 369 }
 370
 371 static inline int mdiobus_c45_read(struct mii_bus *bus, int prtad, int devad,
 372                                    u16 regnum)
 373 {
 374         return mdiobus_read(bus, prtad, mdiobus_c45_addr(devad, regnum));
 375 }
 376
 377 static inline int mdiobus_c45_write(struct mii_bus *bus, int prtad, int devad,
 378                                     u16 regnum, u16 val)
 379 {
 380         return mdiobus_write(bus, prtad, mdiobus_c45_addr(devad, regnum), val);
 381 }
 382
 383 int mdiobus_register_device(struct mdio_device *mdiodev);
 384 int mdiobus_unregister_device(struct mdio_device *mdiodev);
 385 bool mdiobus_is_registered_device(struct mii_bus *bus, int addr);
 386 struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr);
 387
 388 /**
 389  * mdio_module_driver() - Helper macro for registering mdio drivers
 390  * @_mdio_driver: driver to register
 391  *
 392  * Helper macro for MDIO drivers which do not do anything special in module
 393  * init/exit. Each module may only use this macro once, and calling it
 394  * replaces module_init() and module_exit().
 395  */
 396 #define mdio_module_driver(_mdio_driver)                                \
 397 static int __init mdio_module_init(void)                                \
 398 {                                                                       \
 399         return mdio_driver_register(&_mdio_driver);                     \
 400 }                                                                       \
 401 module_init(mdio_module_init);                                          \
 402 static void __exit mdio_module_exit(void)                               \
 403 {                                                                       \
 404         mdio_driver_unregister(&_mdio_driver);                          \
 405 }                                                                       \
 406 module_exit(mdio_module_exit)
 407
 408 #endif /* __LINUX_MDIO_H__ */