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