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