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authorRussell King <rmk+kernel@armlinux.org.uk>2020-01-17 11:10:02 +0000
committerRussell King <rmk+kernel@armlinux.org.uk>2020-04-02 19:45:32 +0100
commit7de9bd54ea987057223a0f8dd82e92bd4693767f (patch)
tree6155450617537c35babe4e1550e71f44ca2eaed3
parent5b76cc424b1afe23271a6320382731eeaad7bd46 (diff)
net: phylink: pcs: add 802.3 clause 22 helpers
Implement helpers for PCS accessed via the MII bus using 802.3 clause 22 cycles, conforming to 802.3 clause 37 and Cisco SGMII specifications for the advertisement word. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
-rw-r--r--drivers/net/phy/phylink.c205
-rw-r--r--include/linux/phylink.h6
2 files changed, 211 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");
diff --git a/include/linux/phylink.h b/include/linux/phylink.h
index 2180eb1aa254..de591c2fb37e 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -317,4 +317,10 @@ int phylink_mii_ioctl(struct phylink *, struct ifreq *, int);
void phylink_set_port_modes(unsigned long *bits);
void phylink_helper_basex_speed(struct phylink_link_state *state);
+void phylink_mii_c22_pcs_get_state(struct mdio_device *pcs,
+ struct phylink_link_state *state);
+int phylink_mii_c22_pcs_set_advertisement(struct mdio_device *pcs,
+ const struct phylink_link_state *state);
+void phylink_mii_c22_pcs_an_restart(struct mdio_device *pcs);
+
#endif