include/linux/phylink.h

   1 #ifndef NETDEV_PCS_H
   2 #define NETDEV_PCS_H
   3
   4 #include <linux/phy.h>
   5 #include <linux/spinlock.h>
   6 #include <linux/workqueue.h>
   7
   8 struct device_node;
   9 struct ethtool_cmd;
  10 struct fwnode_handle;
  11 struct net_device;
  12
  13 enum {
  14         MLO_PAUSE_NONE,
  15         MLO_PAUSE_RX = BIT(0),
  16         MLO_PAUSE_TX = BIT(1),
  17         MLO_PAUSE_TXRX_MASK = MLO_PAUSE_TX | MLO_PAUSE_RX,
  18         MLO_PAUSE_AN = BIT(2),
  19
  20         MLO_AN_PHY = 0, /* Conventional PHY */
  21         MLO_AN_FIXED,   /* Fixed-link mode */
  22         MLO_AN_INBAND,  /* In-band protocol */
  23 };
  24
  25 static inline bool phylink_autoneg_inband(unsigned int mode)
  26 {
  27         return mode == MLO_AN_INBAND;
  28 }
  29
  30 /**
  31  * struct phylink_link_state - link state structure
  32  * @advertising: ethtool bitmask containing advertised link modes
  33  * @lp_advertising: ethtool bitmask containing link partner advertised link
  34  *   modes
  35  * @interface: link &typedef phy_interface_t mode
  36  * @speed: link speed, one of the SPEED_* constants.
  37  * @duplex: link duplex mode, one of DUPLEX_* constants.
  38  * @pause: link pause state, described by MLO_PAUSE_* constants.
  39  * @link: true if the link is up.
  40  * @an_enabled: true if autonegotiation is enabled/desired.
  41  * @an_complete: true if autonegotiation has completed.
  42  */
  43 struct phylink_link_state {
  44         __ETHTOOL_DECLARE_LINK_MODE_MASK(advertising);
  45         __ETHTOOL_DECLARE_LINK_MODE_MASK(lp_advertising);
  46         phy_interface_t interface;
  47         int speed;
  48         int duplex;
  49         int pause;
  50         unsigned int link:1;
  51         unsigned int an_enabled:1;
  52         unsigned int an_complete:1;
  53 };
  54
  55 enum phylink_op_type {
  56         PHYLINK_NETDEV = 0,
  57         PHYLINK_DEV,
  58 };
  59
  60 /**
  61  * struct phylink_config - PHYLINK configuration structure
  62  * @dev: a pointer to a struct device associated with the MAC
  63  * @type: operation type of PHYLINK instance
  64  * @pcs_poll: MAC PCS cannot provide link change interrupt
  65  */
  66 struct phylink_config {
  67         struct device *dev;
  68         enum phylink_op_type type;
  69         bool pcs_poll;
  70         bool poll_fixed_state;
  71         void (*get_fixed_state)(struct phylink_config *config,
  72                                 struct phylink_link_state *state);
  73 };
  74
  75 /**
  76  * struct phylink_mac_ops - MAC operations structure.
  77  * @validate: Validate and update the link configuration.
  78  * @mac_pcs_get_state: Read the current link state from the hardware.
  79  * @mac_config: configure the MAC for the selected mode and state.
  80  * @mac_an_restart: restart 802.3z BaseX autonegotiation.
  81  * @mac_link_down: take the link down.
  82  * @mac_link_up: allow the link to come up.
  83  *
  84  * The individual methods are described more fully below.
  85  */
  86 struct phylink_mac_ops {
  87         void (*validate)(struct phylink_config *config,
  88                          unsigned long *supported,
  89                          struct phylink_link_state *state);
  90         void (*mac_pcs_get_state)(struct phylink_config *config,
  91                                   struct phylink_link_state *state);
  92         void (*mac_config)(struct phylink_config *config, unsigned int mode,
  93                            const struct phylink_link_state *state);
  94         void (*mac_an_restart)(struct phylink_config *config);
  95         void (*mac_link_down)(struct phylink_config *config, unsigned int mode,
  96                               phy_interface_t interface);
  97         void (*mac_link_up)(struct phylink_config *config,
  98                             struct phy_device *phy, unsigned int mode,
  99                             phy_interface_t interface, int speed, int duplex,
 100                             bool tx_pause, bool rx_pause);
 101 };
 102
 103 #if 0 /* For kernel-doc purposes only. */
 104 /**
 105  * validate - Validate and update the link configuration
 106  * @config: a pointer to a &struct phylink_config.
 107  * @supported: ethtool bitmask for supported link modes.
 108  * @state: a pointer to a &struct phylink_link_state.
 109  *
 110  * Clear bits in the @supported and @state->advertising masks that
 111  * are not supportable by the MAC.
 112  *
 113  * Note that the PHY may be able to transform from one connection
 114  * technology to another, so, eg, don't clear 1000BaseX just
 115  * because the MAC is unable to BaseX mode. This is more about
 116  * clearing unsupported speeds and duplex settings. The port modes
 117  * should not be cleared; phylink_set_port_modes() will help with this.
 118  *
 119  * If the @state->interface mode is %PHY_INTERFACE_MODE_1000BASEX
 120  * or %PHY_INTERFACE_MODE_2500BASEX, select the appropriate mode
 121  * based on @state->advertising and/or @state->speed and update
 122  * @state->interface accordingly. See phylink_helper_basex_speed().
 123  *
 124  * When @state->interface is %PHY_INTERFACE_MODE_NA, phylink expects the
 125  * MAC driver to return all supported link modes.
 126  *
 127  * If the @state->interface mode is not supported, then the @supported
 128  * mask must be cleared.
 129  */
 130 void validate(struct phylink_config *config, unsigned long *supported,
 131               struct phylink_link_state *state);
 132
 133 /**
 134  * mac_pcs_get_state() - Read the current inband link state from the hardware
 135  * @config: a pointer to a &struct phylink_config.
 136  * @state: a pointer to a &struct phylink_link_state.
 137  *
 138  * Read the current inband link state from the MAC PCS, reporting the
 139  * current speed in @state->speed, duplex mode in @state->duplex, pause
 140  * mode in @state->pause using the %MLO_PAUSE_RX and %MLO_PAUSE_TX bits,
 141  * negotiation completion state in @state->an_complete, and link up state
 142  * in @state->link. If possible, @state->lp_advertising should also be
 143  * populated.
 144  */
 145 void mac_pcs_get_state(struct phylink_config *config,
 146                        struct phylink_link_state *state);
 147
 148 /**
 149  * mac_config() - configure the MAC for the selected mode and state
 150  * @config: a pointer to a &struct phylink_config.
 151  * @mode: one of %MLO_AN_FIXED, %MLO_AN_PHY, %MLO_AN_INBAND.
 152  * @state: a pointer to a &struct phylink_link_state.
 153  *
 154  * Note - not all members of @state are valid.  In particular,
 155  * @state->lp_advertising, @state->link, @state->an_complete are never
 156  * guaranteed to be correct, and so any mac_config() implementation must
 157  * never reference these fields.
 158  *
 159  * (this requires a rewrite - please refer to mac_link_up() for situations
 160  *  where the PCS and MAC are not tightly integrated.)
 161  *
 162  * In all negotiation modes, as defined by @mode, @state->pause indicates the
 163  * pause settings which should be applied as follows. If %MLO_PAUSE_AN is not
 164  * set, %MLO_PAUSE_TX and %MLO_PAUSE_RX indicate whether the MAC should send
 165  * pause frames and/or act on received pause frames respectively. Otherwise,
 166  * the results of in-band negotiation/status from the MAC PCS should be used
 167  * to control the MAC pause mode settings.
 168  *
 169  * The action performed depends on the currently selected mode:
 170  *
 171  * %MLO_AN_FIXED, %MLO_AN_PHY:
 172  *   Configure for non-inband negotiation mode, where the link settings
 173  *   are completely communicated via mac_link_up().  The physical link
 174  *   protocol from the MAC is specified by @state->interface.
 175  *
 176  *   @state->advertising may be used, but is not required.
 177  *
 178  *   Older drivers (prior to the mac_link_up() change) may use @state->speed,
 179  *   @state->duplex and @state->pause to configure the MAC, but this is
 180  *   deprecated; such drivers should be converted to use mac_link_up().
 181  *
 182  *   Other members of @state must be ignored.
 183  *
 184  *   Valid state members: interface, advertising.
 185  *   Deprecated state members: speed, duplex, pause.
 186  *
 187  * %MLO_AN_INBAND:
 188  *   place the link in an inband negotiation mode (such as 802.3z
 189  *   1000base-X or Cisco SGMII mode depending on the @state->interface
 190  *   mode). In both cases, link state management (whether the link
 191  *   is up or not) is performed by the MAC, and reported via the
 192  *   mac_pcs_get_state() callback. Changes in link state must be made
 193  *   by calling phylink_mac_change().
 194  *
 195  *   Interface mode specific details are mentioned below.
 196  *
 197  *   If in 802.3z mode, the link speed is fixed, dependent on the
 198  *   @state->interface. Duplex and pause modes are negotiated via
 199  *   the in-band configuration word. Advertised pause modes are set
 200  *   according to the @state->an_enabled and @state->advertising
 201  *   flags. Beware of MACs which only support full duplex at gigabit
 202  *   and higher speeds.
 203  *
 204  *   If in Cisco SGMII mode, the link speed and duplex mode are passed
 205  *   in the serial bitstream 16-bit configuration word, and the MAC
 206  *   should be configured to read these bits and acknowledge the
 207  *   configuration word. Nothing is advertised by the MAC. The MAC is
 208  *   responsible for reading the configuration word and configuring
 209  *   itself accordingly.
 210  *
 211  *   Valid state members: interface, an_enabled, pause, advertising.
 212  *
 213  * Implementations are expected to update the MAC to reflect the
 214  * requested settings - i.o.w., if nothing has changed between two
 215  * calls, no action is expected.  If only flow control settings have
 216  * changed, flow control should be updated *without* taking the link
 217  * down.  This "update" behaviour is critical to avoid bouncing the
 218  * link up status.
 219  */
 220 void mac_config(struct phylink_config *config, unsigned int mode,
 221                 const struct phylink_link_state *state);
 222
 223 /**
 224  * mac_an_restart() - restart 802.3z BaseX autonegotiation
 225  * @config: a pointer to a &struct phylink_config.
 226  */
 227 void mac_an_restart(struct phylink_config *config);
 228
 229 /**
 230  * mac_link_down() - take the link down
 231  * @config: a pointer to a &struct phylink_config.
 232  * @mode: link autonegotiation mode
 233  * @interface: link &typedef phy_interface_t mode
 234  *
 235  * If @mode is not an in-band negotiation mode (as defined by
 236  * phylink_autoneg_inband()), force the link down and disable any
 237  * Energy Efficient Ethernet MAC configuration. Interface type
 238  * selection must be done in mac_config().
 239  */
 240 void mac_link_down(struct phylink_config *config, unsigned int mode,
 241                    phy_interface_t interface);
 242
 243 /**
 244  * mac_link_up() - allow the link to come up
 245  * @config: a pointer to a &struct phylink_config.
 246  * @phy: any attached phy
 247  * @mode: link autonegotiation mode
 248  * @interface: link &typedef phy_interface_t mode
 249  * @speed: link speed
 250  * @duplex: link duplex
 251  * @tx_pause: link transmit pause enablement status
 252  * @rx_pause: link receive pause enablement status
 253  *
 254  * Configure the MAC for an established link.
 255  *
 256  * @speed, @duplex, @tx_pause and @rx_pause indicate the finalised link
 257  * settings, and should be used to configure the MAC block appropriately
 258  * where these settings are not automatically conveyed from the PCS block,
 259  * or if in-band negotiation (as defined by phylink_autoneg_inband(@mode))
 260  * is disabled.
 261  *
 262  * Note that when 802.3z in-band negotiation is in use, it is possible
 263  * that the user wishes to override the pause settings, and this should
 264  * be allowed when considering the implementation of this method.
 265  *
 266  * If in-band negotiation mode is disabled, allow the link to come up. If
 267  * @phy is non-%NULL, configure Energy Efficient Ethernet by calling
 268  * phy_init_eee() and perform appropriate MAC configuration for EEE.
 269  * Interface type selection must be done in mac_config().
 270  */
 271 void mac_link_up(struct phylink_config *config, struct phy_device *phy,
 272                  unsigned int mode, phy_interface_t interface,
 273                  int speed, int duplex, bool tx_pause, bool rx_pause);
 274 #endif
 275
 276 /**
 277  * struct phylink_pcs_ops - MAC PCS operations structure.
 278  * @pcs_get_state: read the current MAC PCS link state from the hardware.
 279  * @pcs_config: configure the MAC PCS for the selected mode and state.
 280  * @pcs_an_restart: restart 802.3z BaseX autonegotiation.
 281  * @pcs_link_up: program the PCS for the resolved link configuration
 282  *               (where necessary).
 283  */
 284 struct phylink_pcs_ops {
 285         void (*pcs_get_state)(struct phylink_config *config,
 286                               struct phylink_link_state *state);
 287         int (*pcs_config)(struct phylink_config *config, unsigned int mode,
 288                           phy_interface_t interface,
 289                           const unsigned long *advertising);
 290         void (*pcs_an_restart)(struct phylink_config *config);
 291         void (*pcs_link_up)(struct phylink_config *config, unsigned int mode,
 292                             phy_interface_t interface, int speed, int duplex);
 293 };
 294
 295 #if 0 /* For kernel-doc purposes only. */
 296 /**
 297  * pcs_get_state() - Read the current inband link state from the hardware
 298  * @config: a pointer to a &struct phylink_config.
 299  * @state: a pointer to a &struct phylink_link_state.
 300  *
 301  * Read the current inband link state from the MAC PCS, reporting the
 302  * current speed in @state->speed, duplex mode in @state->duplex, pause
 303  * mode in @state->pause using the %MLO_PAUSE_RX and %MLO_PAUSE_TX bits,
 304  * negotiation completion state in @state->an_complete, and link up state
 305  * in @state->link. If possible, @state->lp_advertising should also be
 306  * populated.
 307  *
 308  * When present, this overrides mac_pcs_get_state() in &struct
 309  * phylink_mac_ops.
 310  */
 311 void pcs_get_state(struct phylink_config *config,
 312                    struct phylink_link_state *state);
 313
 314 /**
 315  * pcs_config() - Configure the PCS mode and advertisement
 316  * @config: a pointer to a &struct phylink_config.
 317  * @mode: one of %MLO_AN_FIXED, %MLO_AN_PHY, %MLO_AN_INBAND.
 318  * @interface: interface mode to be used
 319  * @advertising: adertisement ethtool link mode mask
 320  *
 321  * Configure the PCS for the operating mode, the interface mode, and set
 322  * the advertisement mask.
 323  *
 324  * When operating in %MLO_AN_INBAND, inband should always be enabled,
 325  * otherwise inband should be disabled.
 326  *
 327  * For SGMII, there is no advertisement from the MAC side, the PCS should
 328  * be programmed to acknowledge the inband word from the PHY.
 329  *
 330  * For 1000BASE-X, the advertisement should be programmed into the PCS.
 331  *
 332  * For most 10GBASE-R, there is no advertisement.
 333  */
 334 int (*pcs_config)(struct phylink_config *config, unsigned int mode,
 335                   phy_interface_t interface, const unsigned long *advertising);
 336
 337 /**
 338  * pcs_an_restart() - restart 802.3z BaseX autonegotiation
 339  * @config: a pointer to a &struct phylink_config.
 340  *
 341  * When PCS ops are present, this overrides mac_an_restart() in &struct
 342  * phylink_mac_ops.
 343  */
 344 void (*pcs_an_restart)(struct phylink_config *config);
 345
 346 /**
 347  * pcs_link_up() - program the PCS for the resolved link configuration
 348  * @config: a pointer to a &struct phylink_config.
 349  * @mode: link autonegotiation mode
 350  * @interface: link &typedef phy_interface_t mode
 351  * @speed: link speed
 352  * @duplex: link duplex
 353  *
 354  * This call will be made just before mac_link_up() to inform the PCS of
 355  * the resolved link parameters. For example, a PCS operating in SGMII
 356  * mode without in-band AN needs to be manually configured for the link
 357  * and duplex setting. Otherwise, this should be a no-op.
 358  */
 359 void (*pcs_link_up)(struct phylink_config *config, unsigned int mode,
 360                     phy_interface_t interface, int speed, int duplex);
 361 #endif
 362
 363 struct phylink *phylink_create(struct phylink_config *, struct fwnode_handle *,
 364                                phy_interface_t iface,
 365                                const struct phylink_mac_ops *mac_ops);
 366 void phylink_add_pcs(struct phylink *, const struct phylink_pcs_ops *ops);
 367 void phylink_destroy(struct phylink *);
 368
 369 int phylink_connect_phy(struct phylink *, struct phy_device *);
 370 int phylink_of_phy_connect(struct phylink *, struct device_node *, u32 flags);
 371 void phylink_disconnect_phy(struct phylink *);
 372
 373 void phylink_mac_change(struct phylink *, bool up);
 374
 375 void phylink_start(struct phylink *);
 376 void phylink_stop(struct phylink *);
 377
 378 void phylink_ethtool_get_wol(struct phylink *, struct ethtool_wolinfo *);
 379 int phylink_ethtool_set_wol(struct phylink *, struct ethtool_wolinfo *);
 380
 381 int phylink_ethtool_ksettings_get(struct phylink *,
 382                                   struct ethtool_link_ksettings *);
 383 int phylink_ethtool_ksettings_set(struct phylink *,
 384                                   const struct ethtool_link_ksettings *);
 385 int phylink_ethtool_nway_reset(struct phylink *);
 386 void phylink_ethtool_get_pauseparam(struct phylink *,
 387                                     struct ethtool_pauseparam *);
 388 int phylink_ethtool_set_pauseparam(struct phylink *,
 389                                    struct ethtool_pauseparam *);
 390 int phylink_get_eee_err(struct phylink *);
 391 int phylink_init_eee(struct phylink *, bool);
 392 int phylink_ethtool_get_eee(struct phylink *, struct ethtool_eee *);
 393 int phylink_ethtool_set_eee(struct phylink *, struct ethtool_eee *);
 394 int phylink_mii_ioctl(struct phylink *, struct ifreq *, int);
 395
 396 #define phylink_zero(bm) \
 397         bitmap_zero(bm, __ETHTOOL_LINK_MODE_MASK_NBITS)
 398 #define __phylink_do_bit(op, bm, mode) \
 399         op(ETHTOOL_LINK_MODE_ ## mode ## _BIT, bm)
 400
 401 #define phylink_set(bm, mode)   __phylink_do_bit(__set_bit, bm, mode)
 402 #define phylink_clear(bm, mode) __phylink_do_bit(__clear_bit, bm, mode)
 403 #define phylink_test(bm, mode)  __phylink_do_bit(test_bit, bm, mode)
 404
 405 void phylink_set_port_modes(unsigned long *bits);
 406 void phylink_helper_basex_speed(struct phylink_link_state *state);
 407
 408 void phylink_mii_c22_pcs_get_state(struct mdio_device *pcs,
 409                                    struct phylink_link_state *state);
 410 int phylink_mii_c22_pcs_set_advertisement(struct mdio_device *pcs,
 411                                           phy_interface_t interface,
 412                                           const unsigned long *advertising);
 413 void phylink_mii_c22_pcs_an_restart(struct mdio_device *pcs);
 414
 415 void phylink_mii_c45_pcs_get_state(struct mdio_device *pcs,
 416                                    struct phylink_link_state *state);
 417 #endif