include/linux/mdio.h

   1 /*
   2  * linux/mdio.h: definitions for MDIO (clause 45) transceivers
   3  * Copyright 2006-2009 Solarflare Communications Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published
   7  * by the Free Software Foundation, incorporated herein by reference.
   8  */
   9 #ifndef __LINUX_MDIO_H__
  10 #define __LINUX_MDIO_H__
  11
  12 #include <uapi/linux/mdio.h>
  13 #include <linux/mod_devicetable.h>
  14
  15 struct mii_bus;
  16
  17 /* Multiple levels of nesting are possible. However typically this is
  18  * limited to nested DSA like layer, a MUX layer, and the normal
  19  * user. Instead of trying to handle the general case, just define
  20  * these cases.
  21  */
  22 enum mdio_mutex_lock_class {
  23         MDIO_MUTEX_NORMAL,
  24         MDIO_MUTEX_MUX,
  25         MDIO_MUTEX_NESTED,
  26 };
  27
  28 struct mdio_device {
  29         struct device dev;
  30
  31         const struct dev_pm_ops *pm_ops;
  32         struct mii_bus *bus;
  33         char modalias[MDIO_NAME_SIZE];
  34
  35         int (*bus_match)(struct device *dev, struct device_driver *drv);
  36         void (*device_free)(struct mdio_device *mdiodev);
  37         void (*device_remove)(struct mdio_device *mdiodev);
  38
  39         /* Bus address of the MDIO device (0-31) */
  40         int addr;
  41         int flags;
  42 };
  43 #define to_mdio_device(d) container_of(d, struct mdio_device, dev)
  44
  45 /* struct mdio_driver_common: Common to all MDIO drivers */
  46 struct mdio_driver_common {
  47         struct device_driver driver;
  48         int flags;
  49 };
  50 #define MDIO_DEVICE_FLAG_PHY            1
  51 #define to_mdio_common_driver(d) \
  52         container_of(d, struct mdio_driver_common, driver)
  53
  54 /* struct mdio_driver: Generic MDIO driver */
  55 struct mdio_driver {
  56         struct mdio_driver_common mdiodrv;
  57
  58         /*
  59          * Called during discovery.  Used to set
  60          * up device-specific structures, if any
  61          */
  62         int (*probe)(struct mdio_device *mdiodev);
  63
  64         /* Clears up any memory if needed */
  65         void (*remove)(struct mdio_device *mdiodev);
  66 };
  67 #define to_mdio_driver(d)                                               \
  68         container_of(to_mdio_common_driver(d), struct mdio_driver, mdiodrv)
  69
  70 void mdio_device_free(struct mdio_device *mdiodev);
  71 struct mdio_device *mdio_device_create(struct mii_bus *bus, int addr);
  72 int mdio_device_register(struct mdio_device *mdiodev);
  73 void mdio_device_remove(struct mdio_device *mdiodev);
  74 int mdio_driver_register(struct mdio_driver *drv);
  75 void mdio_driver_unregister(struct mdio_driver *drv);
  76 int mdio_device_bus_match(struct device *dev, struct device_driver *drv);
  77
  78 static inline bool mdio_phy_id_is_c45(int phy_id)
  79 {
  80         return (phy_id & MDIO_PHY_ID_C45) && !(phy_id & ~MDIO_PHY_ID_C45_MASK);
  81 }
  82
  83 static inline __u16 mdio_phy_id_prtad(int phy_id)
  84 {
  85         return (phy_id & MDIO_PHY_ID_PRTAD) >> 5;
  86 }
  87
  88 static inline __u16 mdio_phy_id_devad(int phy_id)
  89 {
  90         return phy_id & MDIO_PHY_ID_DEVAD;
  91 }
  92
  93 /**
  94  * struct mdio_if_info - Ethernet controller MDIO interface
  95  * @prtad: PRTAD of the PHY (%MDIO_PRTAD_NONE if not present/unknown)
  96  * @mmds: Mask of MMDs expected to be present in the PHY.  This must be
  97  *      non-zero unless @prtad = %MDIO_PRTAD_NONE.
  98  * @mode_support: MDIO modes supported.  If %MDIO_SUPPORTS_C22 is set then
  99  *      MII register access will be passed through with @devad =
 100  *      %MDIO_DEVAD_NONE.  If %MDIO_EMULATE_C22 is set then access to
 101  *      commonly used clause 22 registers will be translated into
 102  *      clause 45 registers.
 103  * @dev: Net device structure
 104  * @mdio_read: Register read function; returns value or negative error code
 105  * @mdio_write: Register write function; returns 0 or negative error code
 106  */
 107 struct mdio_if_info {
 108         int prtad;
 109         u32 mmds;
 110         unsigned mode_support;
 111
 112         struct net_device *dev;
 113         int (*mdio_read)(struct net_device *dev, int prtad, int devad,
 114                          u16 addr);
 115         int (*mdio_write)(struct net_device *dev, int prtad, int devad,
 116                           u16 addr, u16 val);
 117 };
 118
 119 #define MDIO_PRTAD_NONE                 (-1)
 120 #define MDIO_DEVAD_NONE                 (-1)
 121 #define MDIO_SUPPORTS_C22               1
 122 #define MDIO_SUPPORTS_C45               2
 123 #define MDIO_EMULATE_C22                4
 124
 125 struct ethtool_cmd;
 126 struct ethtool_pauseparam;
 127 extern int mdio45_probe(struct mdio_if_info *mdio, int prtad);
 128 extern int mdio_set_flag(const struct mdio_if_info *mdio,
 129                          int prtad, int devad, u16 addr, int mask,
 130                          bool sense);
 131 extern int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmds);
 132 extern int mdio45_nway_restart(const struct mdio_if_info *mdio);
 133 extern void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
 134                                       struct ethtool_cmd *ecmd,
 135                                       u32 npage_adv, u32 npage_lpa);
 136 extern void
 137 mdio45_ethtool_ksettings_get_npage(const struct mdio_if_info *mdio,
 138                                    struct ethtool_link_ksettings *cmd,
 139                                    u32 npage_adv, u32 npage_lpa);
 140
 141 /**
 142  * mdio45_ethtool_gset - get settings for ETHTOOL_GSET
 143  * @mdio: MDIO interface
 144  * @ecmd: Ethtool request structure
 145  *
 146  * Since the CSRs for auto-negotiation using next pages are not fully
 147  * standardised, this function does not attempt to decode them.  Use
 148  * mdio45_ethtool_gset_npage() to specify advertisement bits from next
 149  * pages.
 150  */
 151 static inline void mdio45_ethtool_gset(const struct mdio_if_info *mdio,
 152                                        struct ethtool_cmd *ecmd)
 153 {
 154         mdio45_ethtool_gset_npage(mdio, ecmd, 0, 0);
 155 }
 156
 157 /**
 158  * mdio45_ethtool_ksettings_get - get settings for ETHTOOL_GLINKSETTINGS
 159  * @mdio: MDIO interface
 160  * @cmd: Ethtool request structure
 161  *
 162  * Since the CSRs for auto-negotiation using next pages are not fully
 163  * standardised, this function does not attempt to decode them.  Use
 164  * mdio45_ethtool_ksettings_get_npage() to specify advertisement bits
 165  * from next pages.
 166  */
 167 static inline void
 168 mdio45_ethtool_ksettings_get(const struct mdio_if_info *mdio,
 169                              struct ethtool_link_ksettings *cmd)
 170 {
 171         mdio45_ethtool_ksettings_get_npage(mdio, cmd, 0, 0);
 172 }
 173
 174 extern int mdio_mii_ioctl(const struct mdio_if_info *mdio,
 175                           struct mii_ioctl_data *mii_data, int cmd);
 176
 177 /**
 178  * mmd_eee_cap_to_ethtool_sup_t
 179  * @eee_cap: value of the MMD EEE Capability register
 180  *
 181  * A small helper function that translates MMD EEE Capability (3.20) bits
 182  * to ethtool supported settings.
 183  */
 184 static inline u32 mmd_eee_cap_to_ethtool_sup_t(u16 eee_cap)
 185 {
 186         u32 supported = 0;
 187
 188         if (eee_cap & MDIO_EEE_100TX)
 189                 supported |= SUPPORTED_100baseT_Full;
 190         if (eee_cap & MDIO_EEE_1000T)
 191                 supported |= SUPPORTED_1000baseT_Full;
 192         if (eee_cap & MDIO_EEE_10GT)
 193                 supported |= SUPPORTED_10000baseT_Full;
 194         if (eee_cap & MDIO_EEE_1000KX)
 195                 supported |= SUPPORTED_1000baseKX_Full;
 196         if (eee_cap & MDIO_EEE_10GKX4)
 197                 supported |= SUPPORTED_10000baseKX4_Full;
 198         if (eee_cap & MDIO_EEE_10GKR)
 199                 supported |= SUPPORTED_10000baseKR_Full;
 200
 201         return supported;
 202 }
 203
 204 /**
 205  * mmd_eee_adv_to_ethtool_adv_t
 206  * @eee_adv: value of the MMD EEE Advertisement/Link Partner Ability registers
 207  *
 208  * A small helper function that translates the MMD EEE Advertisment (7.60)
 209  * and MMD EEE Link Partner Ability (7.61) bits to ethtool advertisement
 210  * settings.
 211  */
 212 static inline u32 mmd_eee_adv_to_ethtool_adv_t(u16 eee_adv)
 213 {
 214         u32 adv = 0;
 215
 216         if (eee_adv & MDIO_EEE_100TX)
 217                 adv |= ADVERTISED_100baseT_Full;
 218         if (eee_adv & MDIO_EEE_1000T)
 219                 adv |= ADVERTISED_1000baseT_Full;
 220         if (eee_adv & MDIO_EEE_10GT)
 221                 adv |= ADVERTISED_10000baseT_Full;
 222         if (eee_adv & MDIO_EEE_1000KX)
 223                 adv |= ADVERTISED_1000baseKX_Full;
 224         if (eee_adv & MDIO_EEE_10GKX4)
 225                 adv |= ADVERTISED_10000baseKX4_Full;
 226         if (eee_adv & MDIO_EEE_10GKR)
 227                 adv |= ADVERTISED_10000baseKR_Full;
 228
 229         return adv;
 230 }
 231
 232 /**
 233  * ethtool_adv_to_mmd_eee_adv_t
 234  * @adv: the ethtool advertisement settings
 235  *
 236  * A small helper function that translates ethtool advertisement settings
 237  * to EEE advertisements for the MMD EEE Advertisement (7.60) and
 238  * MMD EEE Link Partner Ability (7.61) registers.
 239  */
 240 static inline u16 ethtool_adv_to_mmd_eee_adv_t(u32 adv)
 241 {
 242         u16 reg = 0;
 243
 244         if (adv & ADVERTISED_100baseT_Full)
 245                 reg |= MDIO_EEE_100TX;
 246         if (adv & ADVERTISED_1000baseT_Full)
 247                 reg |= MDIO_EEE_1000T;
 248         if (adv & ADVERTISED_10000baseT_Full)
 249                 reg |= MDIO_EEE_10GT;
 250         if (adv & ADVERTISED_1000baseKX_Full)
 251                 reg |= MDIO_EEE_1000KX;
 252         if (adv & ADVERTISED_10000baseKX4_Full)
 253                 reg |= MDIO_EEE_10GKX4;
 254         if (adv & ADVERTISED_10000baseKR_Full)
 255                 reg |= MDIO_EEE_10GKR;
 256
 257         return reg;
 258 }
 259
 260 int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
 261 int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum);
 262 int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
 263 int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val);
 264
 265 int mdiobus_register_device(struct mdio_device *mdiodev);
 266 int mdiobus_unregister_device(struct mdio_device *mdiodev);
 267 bool mdiobus_is_registered_device(struct mii_bus *bus, int addr);
 268 struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr);
 269
 270 /**
 271  * mdio_module_driver() - Helper macro for registering mdio drivers
 272  *
 273  * Helper macro for MDIO drivers which do not do anything special in module
 274  * init/exit. Each module may only use this macro once, and calling it
 275  * replaces module_init() and module_exit().
 276  */
 277 #define mdio_module_driver(_mdio_driver)                                \
 278 static int __init mdio_module_init(void)                                \
 279 {                                                                       \
 280         return mdio_driver_register(&_mdio_driver);                     \
 281 }                                                                       \
 282 module_init(mdio_module_init);                                          \
 283 static void __exit mdio_module_exit(void)                               \
 284 {                                                                       \
 285         mdio_driver_unregister(&_mdio_driver);                          \
 286 }                                                                       \
 287 module_exit(mdio_module_exit)
 288
 289 #endif /* __LINUX_MDIO_H__ */