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