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