+/**
+ * ixgbe_fc_autoneg_backplane_x550em_a - Enable flow control IEEE clause 37
+ * @hw: pointer to hardware structure
+ *
+ * Enable flow control according to IEEE clause 37.
+ **/
+void ixgbe_fc_autoneg_backplane_x550em_a(struct ixgbe_hw *hw)
+{
+ u32 link_s1, lp_an_page_low, an_cntl_1;
+ s32 status = IXGBE_ERR_FC_NOT_NEGOTIATED;
+ ixgbe_link_speed speed;
+ bool link_up;
+
+ /* AN should have completed when the cable was plugged in.
+ * Look for reasons to bail out. Bail out if:
+ * - FC autoneg is disabled, or if
+ * - link is not up.
+ */
+ if (hw->fc.disable_fc_autoneg) {
+ ERROR_REPORT1(IXGBE_ERROR_UNSUPPORTED,
+ "Flow control autoneg is disabled");
+ goto out;
+ }
+
+ hw->mac.ops.check_link(hw, &speed, &link_up, false);
+ if (!link_up) {
+ ERROR_REPORT1(IXGBE_ERROR_SOFTWARE, "The link is down");
+ goto out;
+ }
+
+ /* Check at auto-negotiation has completed */
+ status = hw->mac.ops.read_iosf_sb_reg(hw,
+ IXGBE_KRM_LINK_S1(hw->bus.lan_id),
+ IXGBE_SB_IOSF_TARGET_KR_PHY, &link_s1);
+
+ if (status != IXGBE_SUCCESS ||
+ (link_s1 & IXGBE_KRM_LINK_S1_MAC_AN_COMPLETE) == 0) {
+ DEBUGOUT("Auto-Negotiation did not complete\n");
+ status = IXGBE_ERR_FC_NOT_NEGOTIATED;
+ goto out;
+ }
+
+ /* Read the 10g AN autoc and LP ability registers and resolve
+ * local flow control settings accordingly
+ */
+ status = hw->mac.ops.read_iosf_sb_reg(hw,
+ IXGBE_KRM_AN_CNTL_1(hw->bus.lan_id),
+ IXGBE_SB_IOSF_TARGET_KR_PHY, &an_cntl_1);
+
+ if (status != IXGBE_SUCCESS) {
+ DEBUGOUT("Auto-Negotiation did not complete\n");
+ goto out;
+ }
+
+ status = hw->mac.ops.read_iosf_sb_reg(hw,
+ IXGBE_KRM_LP_BASE_PAGE_HIGH(hw->bus.lan_id),
+ IXGBE_SB_IOSF_TARGET_KR_PHY, &lp_an_page_low);
+
+ if (status != IXGBE_SUCCESS) {
+ DEBUGOUT("Auto-Negotiation did not complete\n");
+ goto out;
+ }
+
+ status = ixgbe_negotiate_fc(hw, an_cntl_1, lp_an_page_low,
+ IXGBE_KRM_AN_CNTL_1_SYM_PAUSE,
+ IXGBE_KRM_AN_CNTL_1_ASM_PAUSE,
+ IXGBE_KRM_LP_BASE_PAGE_HIGH_SYM_PAUSE,
+ IXGBE_KRM_LP_BASE_PAGE_HIGH_ASM_PAUSE);
+
+out:
+ if (status == IXGBE_SUCCESS) {
+ hw->fc.fc_was_autonegged = true;
+ } else {
+ hw->fc.fc_was_autonegged = false;
+ hw->fc.current_mode = hw->fc.requested_mode;
+ }
+}
+
+/**
+ * ixgbe_fc_autoneg_fiber_x550em_a - passthrough FC settings
+ * @hw: pointer to hardware structure
+ *
+ **/
+void ixgbe_fc_autoneg_fiber_x550em_a(struct ixgbe_hw *hw)
+{
+ hw->fc.fc_was_autonegged = false;
+ hw->fc.current_mode = hw->fc.requested_mode;
+}
+
+/**
+ * ixgbe_fc_autoneg_sgmii_x550em_a - Enable flow control IEEE clause 37
+ * @hw: pointer to hardware structure
+ *
+ * Enable flow control according to IEEE clause 37.
+ **/
+void ixgbe_fc_autoneg_sgmii_x550em_a(struct ixgbe_hw *hw)
+{
+ s32 status = IXGBE_ERR_FC_NOT_NEGOTIATED;
+ u32 info[FW_PHY_ACT_DATA_COUNT] = { 0 };
+ ixgbe_link_speed speed;
+ bool link_up;
+
+ /* AN should have completed when the cable was plugged in.
+ * Look for reasons to bail out. Bail out if:
+ * - FC autoneg is disabled, or if
+ * - link is not up.
+ */
+ if (hw->fc.disable_fc_autoneg) {
+ ERROR_REPORT1(IXGBE_ERROR_UNSUPPORTED,
+ "Flow control autoneg is disabled");
+ goto out;
+ }
+
+ hw->mac.ops.check_link(hw, &speed, &link_up, false);
+ if (!link_up) {
+ ERROR_REPORT1(IXGBE_ERROR_SOFTWARE, "The link is down");
+ goto out;
+ }
+
+ /* Check if auto-negotiation has completed */
+ status = ixgbe_fw_phy_activity(hw, FW_PHY_ACT_GET_LINK_INFO, &info);
+ if (status != IXGBE_SUCCESS ||
+ !(info[0] & FW_PHY_ACT_GET_LINK_INFO_AN_COMPLETE)) {
+ DEBUGOUT("Auto-Negotiation did not complete\n");
+ status = IXGBE_ERR_FC_NOT_NEGOTIATED;
+ goto out;
+ }
+
+ /* Negotiate the flow control */
+ status = ixgbe_negotiate_fc(hw, info[0], info[0],
+ FW_PHY_ACT_GET_LINK_INFO_FC_RX,
+ FW_PHY_ACT_GET_LINK_INFO_FC_TX,
+ FW_PHY_ACT_GET_LINK_INFO_LP_FC_RX,
+ FW_PHY_ACT_GET_LINK_INFO_LP_FC_TX);
+
+out:
+ if (status == IXGBE_SUCCESS) {
+ hw->fc.fc_was_autonegged = true;
+ } else {
+ hw->fc.fc_was_autonegged = false;
+ hw->fc.current_mode = hw->fc.requested_mode;
+ }
+}
+
+/**
+ * ixgbe_setup_fc_backplane_x550em_a - Set up flow control
+ * @hw: pointer to hardware structure
+ *
+ * Called at init time to set up flow control.
+ **/
+s32 ixgbe_setup_fc_backplane_x550em_a(struct ixgbe_hw *hw)
+{
+ s32 status = IXGBE_SUCCESS;
+ u32 an_cntl = 0;
+
+ DEBUGFUNC("ixgbe_setup_fc_backplane_x550em_a");
+
+ /* Validate the requested mode */
+ if (hw->fc.strict_ieee && hw->fc.requested_mode == ixgbe_fc_rx_pause) {
+ ERROR_REPORT1(IXGBE_ERROR_UNSUPPORTED,
+ "ixgbe_fc_rx_pause not valid in strict IEEE mode\n");
+ return IXGBE_ERR_INVALID_LINK_SETTINGS;
+ }
+
+ if (hw->fc.requested_mode == ixgbe_fc_default)
+ hw->fc.requested_mode = ixgbe_fc_full;
+
+ /* Set up the 1G and 10G flow control advertisement registers so the
+ * HW will be able to do FC autoneg once the cable is plugged in. If
+ * we link at 10G, the 1G advertisement is harmless and vice versa.
+ */
+ status = hw->mac.ops.read_iosf_sb_reg(hw,
+ IXGBE_KRM_AN_CNTL_1(hw->bus.lan_id),
+ IXGBE_SB_IOSF_TARGET_KR_PHY, &an_cntl);
+
+ if (status != IXGBE_SUCCESS) {
+ DEBUGOUT("Auto-Negotiation did not complete\n");
+ return status;
+ }
+
+ /* The possible values of fc.requested_mode are:
+ * 0: Flow control is completely disabled
+ * 1: Rx flow control is enabled (we can receive pause frames,
+ * but not send pause frames).
+ * 2: Tx flow control is enabled (we can send pause frames but
+ * we do not support receiving pause frames).
+ * 3: Both Rx and Tx flow control (symmetric) are enabled.
+ * other: Invalid.
+ */
+ switch (hw->fc.requested_mode) {
+ case ixgbe_fc_none:
+ /* Flow control completely disabled by software override. */
+ an_cntl &= ~(IXGBE_KRM_AN_CNTL_1_SYM_PAUSE |
+ IXGBE_KRM_AN_CNTL_1_ASM_PAUSE);
+ break;
+ case ixgbe_fc_tx_pause:
+ /* Tx Flow control is enabled, and Rx Flow control is
+ * disabled by software override.
+ */
+ an_cntl |= IXGBE_KRM_AN_CNTL_1_ASM_PAUSE;
+ an_cntl &= ~IXGBE_KRM_AN_CNTL_1_SYM_PAUSE;
+ break;
+ case ixgbe_fc_rx_pause:
+ /* Rx Flow control is enabled and Tx Flow control is
+ * disabled by software override. Since there really
+ * isn't a way to advertise that we are capable of RX
+ * Pause ONLY, we will advertise that we support both
+ * symmetric and asymmetric Rx PAUSE, as such we fall
+ * through to the fc_full statement. Later, we will
+ * disable the adapter's ability to send PAUSE frames.
+ */
+ case ixgbe_fc_full:
+ /* Flow control (both Rx and Tx) is enabled by SW override. */
+ an_cntl |= IXGBE_KRM_AN_CNTL_1_SYM_PAUSE |
+ IXGBE_KRM_AN_CNTL_1_ASM_PAUSE;
+ break;
+ default:
+ ERROR_REPORT1(IXGBE_ERROR_ARGUMENT,
+ "Flow control param set incorrectly\n");
+ return IXGBE_ERR_CONFIG;
+ }
+
+ status = hw->mac.ops.write_iosf_sb_reg(hw,
+ IXGBE_KRM_AN_CNTL_1(hw->bus.lan_id),
+ IXGBE_SB_IOSF_TARGET_KR_PHY, an_cntl);
+
+ /* Restart auto-negotiation. */
+ status = ixgbe_restart_an_internal_phy_x550em(hw);
+
+ return status;
+}
+