diff options
Diffstat (limited to 'drivers/net/phy/phylink.c')
| -rw-r--r-- | drivers/net/phy/phylink.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c index bf5b5026eff4..23a5e68d9222 100644 --- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -2063,4 +2063,209 @@ void phylink_helper_basex_speed(struct phylink_link_state *state) } EXPORT_SYMBOL_GPL(phylink_helper_basex_speed); +static void phylink_decode_c37_word(struct phylink_link_state *state, + uint16_t config_reg, int speed) +{ + bool tx_pause, rx_pause; + int fd_bit; + + if (speed == SPEED_2500) + fd_bit = ETHTOOL_LINK_MODE_2500baseX_Full_BIT; + else + fd_bit = ETHTOOL_LINK_MODE_1000baseX_Full_BIT; + + mii_lpa_mod_linkmode_x(state->lp_advertising, config_reg, fd_bit); + + if (linkmode_test_bit(fd_bit, state->advertising) && + linkmode_test_bit(fd_bit, state->lp_advertising)) { + state->speed = speed; + state->duplex = DUPLEX_FULL; + } else { + /* negotiation failure */ + state->link = false; + } + + linkmode_resolve_pause(state->advertising, state->lp_advertising, + &tx_pause, &rx_pause); + + if (tx_pause) + state->pause |= MLO_PAUSE_TX; + if (rx_pause) + state->pause |= MLO_PAUSE_RX; +} + +static void phylink_decode_sgmii_word(struct phylink_link_state *state, + uint16_t config_reg) +{ + if (!(config_reg & BIT(15))) { + state->link = false; + return; + } + + switch (config_reg & 0x0c00) { + case 0x0000: + state->speed = SPEED_10; + state->duplex = config_reg & 0x1000 ? DUPLEX_FULL : DUPLEX_HALF; + break; + case 0x0400: + state->speed = SPEED_100; + state->duplex = config_reg & 0x1000 ? DUPLEX_FULL : DUPLEX_HALF; + break; + case 0x0800: + state->speed = SPEED_1000; + state->duplex = config_reg & 0x1000 ? DUPLEX_FULL : DUPLEX_HALF; + break; + default: + state->link = false; + break; + } +} + +/** + * phylink_mii_c22_pcs_get_state() - read the MAC PCS state + * @pcs: a pointer to a &struct mdio_device. + * @state: a pointer to a &struct phylink_link_state. + * + * Helper for MAC PCS supporting the 802.3 clause 22 register set for + * clause 37 negotiation and/or SGMII control. + * + * Read the MAC PCS state from the MII device configured in @config and + * parse the Clause 37 or Cisco SGMII link partner negotiation word into + * the phylink @state structure. This is suitable to be directly plugged + * into the mac_pcs_get_state() member of the struct phylink_mac_ops + * structure. + */ +void phylink_mii_c22_pcs_get_state(struct mdio_device *pcs, + struct phylink_link_state *state) +{ + struct mii_bus *bus = pcs->bus; + int addr = pcs->addr; + int bmsr, lpa; + + bmsr = mdiobus_read(bus, addr, MII_BMSR); + lpa = mdiobus_read(bus, addr, MII_LPA); + if (bmsr < 0 || lpa < 0) { + state->link = false; + return; + } + + state->link = !!(bmsr & BMSR_LSTATUS); + state->an_complete = !!(bmsr & BMSR_ANEGCOMPLETE); + if (!state->link) + return; + + switch (state->interface) { + case PHY_INTERFACE_MODE_1000BASEX: + phylink_decode_c37_word(state, lpa, SPEED_1000); + break; + + case PHY_INTERFACE_MODE_2500BASEX: + phylink_decode_c37_word(state, lpa, SPEED_2500); + break; + + case PHY_INTERFACE_MODE_SGMII: + phylink_decode_sgmii_word(state, lpa); + break; + + default: + state->link = false; + break; + } +} +EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_get_state); + +/** + * phylink_mii_c22_pcs_set_advertisement() - configure the clause 37 PCS + * advertisement + * @pcs: a pointer to a &struct mdio_device. + * @state: a pointer to the state being configured. + * + * Helper for MAC PCS supporting the 802.3 clause 22 register set for + * clause 37 negotiation and/or SGMII control. + * + * Configure the clause 37 PCS advertisement as specified by @state. This + * does not trigger a renegotiation; phylink will do that via the + * mac_an_restart() method of the struct phylink_mac_ops structure. + * + * Returns negative error code on failure to configure the advertisement, + * zero if no change has been made, or one if the advertisement has changed. + */ +int phylink_mii_c22_pcs_set_advertisement(struct mdio_device *pcs, + const struct phylink_link_state *state) +{ + struct mii_bus *bus = pcs->bus; + int addr = pcs->addr; + int val, ret; + u16 adv; + + switch (state->interface) { + case PHY_INTERFACE_MODE_1000BASEX: + case PHY_INTERFACE_MODE_2500BASEX: + adv = ADVERTISE_1000XFULL; + if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, + state->advertising)) + adv |= ADVERTISE_1000XPAUSE; + if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, + state->advertising)) + adv |= ADVERTISE_1000XPSE_ASYM; + + val = mdiobus_read(bus, addr, MII_ADVERTISE); + if (val < 0) + return val; + + if (val == adv) + return 0; + + ret = mdiobus_write(bus, addr, MII_ADVERTISE, adv); + if (ret < 0) + return ret; + + return 1; + + case PHY_INTERFACE_MODE_SGMII: + val = mdiobus_read(bus, addr, MII_ADVERTISE); + if (val < 0) + return val; + + if (val == 0x0001) + return 0; + + ret = mdiobus_write(bus, addr, MII_ADVERTISE, 0x0001); + if (ret < 0) + return ret; + + return 1; + + default: + /* Nothing to do for other modes */ + return 0; + } +} +EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_set_advertisement); + +/** + * phylink_mii_c22_pcs_an_restart() - restart 802.3z autonegotiation + * @pcs: a pointer to a &struct mdio_device. + * + * Helper for MAC PCS supporting the 802.3 clause 22 register set for + * clause 37 negotiation. + * + * Restart the clause 37 negotiation with the link partner. This is + * suitable to be directly plugged into the mac_pcs_get_state() member + * of the struct phylink_mac_ops structure. + */ +void phylink_mii_c22_pcs_an_restart(struct mdio_device *pcs) +{ + struct mii_bus *bus = pcs->bus; + int val, addr = pcs->addr; + + val = mdiobus_read(bus, addr, MII_BMCR); + if (val >= 0) { + val |= BMCR_ANRESTART; + + mdiobus_write(bus, addr, MII_BMCR, val); + } +} +EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_an_restart); + MODULE_LICENSE("GPL v2"); |