igc: Add setup link functionality

Add link establishment methods
Add auto negotiation methods
Add read MAC address method

Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/igc/igc.h

@@ -314,6 +314,7 @@ struct igc_adapter {
 	struct work_struct reset_task;
 	struct work_struct watchdog_task;
 	struct work_struct dma_err_task;
+	bool fc_autoneg;
 
 	u8 tx_timeout_factor;
 

drivers/net/ethernet/intel/igc/igc_base.c

@@ -177,6 +177,29 @@ static s32 igc_init_nvm_params_base(struct igc_hw *hw)
 	return 0;
 }
 
+/**
+ * igc_setup_copper_link_base - Configure copper link settings
+ * @hw: pointer to the HW structure
+ *
+ * Configures the link for auto-neg or forced speed and duplex.  Then we check
+ * for link, once link is established calls to configure collision distance
+ * and flow control are called.
+ */
+static s32 igc_setup_copper_link_base(struct igc_hw *hw)
+{
+	s32  ret_val = 0;
+	u32 ctrl;
+
+	ctrl = rd32(IGC_CTRL);
+	ctrl |= IGC_CTRL_SLU;
+	ctrl &= ~(IGC_CTRL_FRCSPD | IGC_CTRL_FRCDPX);
+	wr32(IGC_CTRL, ctrl);
+
+	ret_val = igc_setup_copper_link(hw);
+
+	return ret_val;
+}
+
 /**
  * igc_init_mac_params_base - Init MAC func ptrs.
  * @hw: pointer to the HW structure
@@ -200,6 +223,9 @@ static s32 igc_init_mac_params_base(struct igc_hw *hw)
 	if (mac->type == igc_i225)
 		dev_spec->clear_semaphore_once = true;
 
+	/* physical interface link setup */
+	mac->ops.setup_physical_interface = igc_setup_copper_link_base;
+
 	return 0;
 }
 
@@ -242,6 +268,8 @@ static s32 igc_init_phy_params_base(struct igc_hw *hw)
 	if (ret_val)
 		return ret_val;
 
+	igc_check_for_link_base(hw);
+
 	/* Verify phy id and set remaining function pointers */
 	switch (phy->id) {
 	case I225_I_PHY_ID:
@@ -258,10 +286,22 @@ out:
 
 static s32 igc_get_invariants_base(struct igc_hw *hw)
 {
+	struct igc_mac_info *mac = &hw->mac;
 	u32 link_mode = 0;
 	u32 ctrl_ext = 0;
 	s32 ret_val = 0;
 
+	switch (hw->device_id) {
+	case IGC_DEV_ID_I225_LM:
+	case IGC_DEV_ID_I225_V:
+		mac->type = igc_i225;
+		break;
+	default:
+		return -IGC_ERR_MAC_INIT;
+	}
+
+	hw->phy.media_type = igc_media_type_copper;
+
 	ctrl_ext = rd32(IGC_CTRL_EXT);
 	link_mode = ctrl_ext & IGC_CTRL_EXT_LINK_MODE_MASK;
 

drivers/net/ethernet/intel/igc/igc_defines.h

@@ -13,6 +13,11 @@
 /* Physical Func Reset Done Indication */
 #define IGC_CTRL_EXT_LINK_MODE_MASK	0x00C00000
 
+/* Loop limit on how long we wait for auto-negotiation to complete */
+#define COPPER_LINK_UP_LIMIT		10
+#define PHY_AUTO_NEG_LIMIT		45
+#define PHY_FORCE_LIMIT			20
+
 /* Number of 100 microseconds we wait for PCI Express master disable */
 #define MASTER_DISABLE_TIMEOUT		800
 /*Blocks new Master requests */
@@ -54,6 +59,12 @@
 #define IGC_CTRL_RST		0x04000000  /* Global reset */
 
 #define IGC_CTRL_PHY_RST	0x80000000  /* PHY Reset */
+#define IGC_CTRL_SLU		0x00000040  /* Set link up (Force Link) */
+#define IGC_CTRL_FRCSPD		0x00000800  /* Force Speed */
+#define IGC_CTRL_FRCDPX		0x00001000  /* Force Duplex */
+
+#define IGC_CTRL_RFCE		0x08000000  /* Receive Flow Control enable */
+#define IGC_CTRL_TFCE		0x10000000  /* Transmit flow control enable */
 
 /* PBA constants */
 #define IGC_PBA_34K		0x0022
@@ -66,6 +77,29 @@
 #define IGC_SWFW_EEP_SM		0x1
 #define IGC_SWFW_PHY0_SM	0x2
 
+/* Autoneg Advertisement Register */
+#define NWAY_AR_10T_HD_CAPS	0x0020   /* 10T   Half Duplex Capable */
+#define NWAY_AR_10T_FD_CAPS	0x0040   /* 10T   Full Duplex Capable */
+#define NWAY_AR_100TX_HD_CAPS	0x0080   /* 100TX Half Duplex Capable */
+#define NWAY_AR_100TX_FD_CAPS	0x0100   /* 100TX Full Duplex Capable */
+#define NWAY_AR_PAUSE		0x0400   /* Pause operation desired */
+#define NWAY_AR_ASM_DIR		0x0800   /* Asymmetric Pause Direction bit */
+
+/* Link Partner Ability Register (Base Page) */
+#define NWAY_LPAR_PAUSE		0x0400 /* LP Pause operation desired */
+#define NWAY_LPAR_ASM_DIR	0x0800 /* LP Asymmetric Pause Direction bit */
+
+/* 1000BASE-T Control Register */
+#define CR_1000T_ASYM_PAUSE	0x0080 /* Advertise asymmetric pause bit */
+#define CR_1000T_HD_CAPS	0x0100 /* Advertise 1000T HD capability */
+#define CR_1000T_FD_CAPS	0x0200 /* Advertise 1000T FD capability  */
+
+/* PHY GPY 211 registers */
+#define STANDARD_AN_REG_MASK	0x0007 /* MMD */
+#define ANEG_MULTIGBT_AN_CTRL	0x0020 /* MULTI GBT AN Control Register */
+#define MMD_DEVADDR_SHIFT	16     /* Shift MMD to higher bits */
+#define CR_2500T_FD_CAPS	0x0080 /* Advertise 2500T FD capability */
+
 /* NVM Control */
 /* Number of milliseconds for NVM auto read done after MAC reset. */
 #define AUTO_READ_DONE_TIMEOUT		10
@@ -318,6 +352,10 @@
 #define PHY_STATUS		0x01 /* Status Register */
 #define PHY_ID1			0x02 /* Phy Id Reg (word 1) */
 #define PHY_ID2			0x03 /* Phy Id Reg (word 2) */
+#define PHY_AUTONEG_ADV		0x04 /* Autoneg Advertisement */
+#define PHY_LP_ABILITY		0x05 /* Link Partner Ability (Base Page) */
+#define PHY_1000T_CTRL		0x09 /* 1000Base-T Control Reg */
+#define PHY_1000T_STATUS	0x0A /* 1000Base-T Status Reg */
 
 /* Bit definitions for valid PHY IDs. I = Integrated E = External */
 #define I225_I_PHY_ID		0x67C9DC00

drivers/net/ethernet/intel/igc/igc_mac.c

@@ -92,6 +92,8 @@ s32 igc_setup_link(struct igc_hw *hw)
 	/* In the case of the phy reset being blocked, we already have a link.
 	 * We do not need to set it up again.
 	 */
+	if (igc_check_reset_block(hw))
+		goto out;
 
 	/* If requested flow control is set to default, set flow control
 	 * based on the EEPROM flow control settings.
@@ -142,9 +144,73 @@ out:
  */
 static s32 igc_set_default_fc(struct igc_hw *hw)
 {
+	hw->fc.requested_mode = igc_fc_full;
 	return 0;
 }
 
+/**
+ * igc_force_mac_fc - Force the MAC's flow control settings
+ * @hw: pointer to the HW structure
+ *
+ * Force the MAC's flow control settings.  Sets the TFCE and RFCE bits in the
+ * device control register to reflect the adapter settings.  TFCE and RFCE
+ * need to be explicitly set by software when a copper PHY is used because
+ * autonegotiation is managed by the PHY rather than the MAC.  Software must
+ * also configure these bits when link is forced on a fiber connection.
+ */
+s32 igc_force_mac_fc(struct igc_hw *hw)
+{
+	s32 ret_val = 0;
+	u32 ctrl;
+
+	ctrl = rd32(IGC_CTRL);
+
+	/* Because we didn't get link via the internal auto-negotiation
+	 * mechanism (we either forced link or we got link via PHY
+	 * auto-neg), we have to manually enable/disable transmit an
+	 * receive flow control.
+	 *
+	 * The "Case" statement below enables/disable flow control
+	 * according to the "hw->fc.current_mode" parameter.
+	 *
+	 * The possible values of the "fc" parameter 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
+	 *          frames but we do not receive pause frames).
+	 *      3:  Both Rx and TX flow control (symmetric) is enabled.
+	 *  other:  No other values should be possible at this point.
+	 */
+	hw_dbg("hw->fc.current_mode = %u\n", hw->fc.current_mode);
+
+	switch (hw->fc.current_mode) {
+	case igc_fc_none:
+		ctrl &= (~(IGC_CTRL_TFCE | IGC_CTRL_RFCE));
+		break;
+	case igc_fc_rx_pause:
+		ctrl &= (~IGC_CTRL_TFCE);
+		ctrl |= IGC_CTRL_RFCE;
+		break;
+	case igc_fc_tx_pause:
+		ctrl &= (~IGC_CTRL_RFCE);
+		ctrl |= IGC_CTRL_TFCE;
+		break;
+	case igc_fc_full:
+		ctrl |= (IGC_CTRL_TFCE | IGC_CTRL_RFCE);
+		break;
+	default:
+		hw_dbg("Flow control param set incorrectly\n");
+		ret_val = -IGC_ERR_CONFIG;
+		goto out;
+	}
+
+	wr32(IGC_CTRL, ctrl);
+
+out:
+	return ret_val;
+}
+
 /**
  * igc_set_fc_watermarks - Set flow control high/low watermarks
  * @hw: pointer to the HW structure
@@ -371,6 +437,7 @@ s32 igc_check_for_copper_link(struct igc_hw *hw)
 	 * settings because we may have had to re-autoneg with a
 	 * different link partner.
 	 */
+	ret_val = igc_config_fc_after_link_up(hw);
 	if (ret_val)
 		hw_dbg("Error configuring flow control\n");
 
@@ -399,6 +466,210 @@ void igc_config_collision_dist(struct igc_hw *hw)
 	wrfl();
 }
 
+/**
+ * igc_config_fc_after_link_up - Configures flow control after link
+ * @hw: pointer to the HW structure
+ *
+ * Checks the status of auto-negotiation after link up to ensure that the
+ * speed and duplex were not forced.  If the link needed to be forced, then
+ * flow control needs to be forced also.  If auto-negotiation is enabled
+ * and did not fail, then we configure flow control based on our link
+ * partner.
+ */
+s32 igc_config_fc_after_link_up(struct igc_hw *hw)
+{
+	u16 mii_status_reg, mii_nway_adv_reg, mii_nway_lp_ability_reg;
+	struct igc_mac_info *mac = &hw->mac;
+	u16 speed, duplex;
+	s32 ret_val = 0;
+
+	/* Check for the case where we have fiber media and auto-neg failed
+	 * so we had to force link.  In this case, we need to force the
+	 * configuration of the MAC to match the "fc" parameter.
+	 */
+	if (mac->autoneg_failed) {
+		if (hw->phy.media_type == igc_media_type_copper)
+			ret_val = igc_force_mac_fc(hw);
+	}
+
+	if (ret_val) {
+		hw_dbg("Error forcing flow control settings\n");
+		goto out;
+	}
+
+	/* Check for the case where we have copper media and auto-neg is
+	 * enabled.  In this case, we need to check and see if Auto-Neg
+	 * has completed, and if so, how the PHY and link partner has
+	 * flow control configured.
+	 */
+	if (hw->phy.media_type == igc_media_type_copper && mac->autoneg) {
+		/* Read the MII Status Register and check to see if AutoNeg
+		 * has completed.  We read this twice because this reg has
+		 * some "sticky" (latched) bits.
+		 */
+		ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS,
+					       &mii_status_reg);
+		if (ret_val)
+			goto out;
+		ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS,
+					       &mii_status_reg);
+		if (ret_val)
+			goto out;
+
+		if (!(mii_status_reg & MII_SR_AUTONEG_COMPLETE)) {
+			hw_dbg("Copper PHY and Auto Neg has not completed.\n");
+			goto out;
+		}
+
+		/* The AutoNeg process has completed, so we now need to
+		 * read both the Auto Negotiation Advertisement
+		 * Register (Address 4) and the Auto_Negotiation Base
+		 * Page Ability Register (Address 5) to determine how
+		 * flow control was negotiated.
+		 */
+		ret_val = hw->phy.ops.read_reg(hw, PHY_AUTONEG_ADV,
+					       &mii_nway_adv_reg);
+		if (ret_val)
+			goto out;
+		ret_val = hw->phy.ops.read_reg(hw, PHY_LP_ABILITY,
+					       &mii_nway_lp_ability_reg);
+		if (ret_val)
+			goto out;
+		/* Two bits in the Auto Negotiation Advertisement Register
+		 * (Address 4) and two bits in the Auto Negotiation Base
+		 * Page Ability Register (Address 5) determine flow control
+		 * for both the PHY and the link partner.  The following
+		 * table, taken out of the IEEE 802.3ab/D6.0 dated March 25,
+		 * 1999, describes these PAUSE resolution bits and how flow
+		 * control is determined based upon these settings.
+		 * NOTE:  DC = Don't Care
+		 *
+		 *   LOCAL DEVICE  |   LINK PARTNER
+		 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | NIC Resolution
+		 *-------|---------|-------|---------|--------------------
+		 *   0   |    0    |  DC   |   DC    | igc_fc_none
+		 *   0   |    1    |   0   |   DC    | igc_fc_none
+		 *   0   |    1    |   1   |    0    | igc_fc_none
+		 *   0   |    1    |   1   |    1    | igc_fc_tx_pause
+		 *   1   |    0    |   0   |   DC    | igc_fc_none
+		 *   1   |   DC    |   1   |   DC    | igc_fc_full
+		 *   1   |    1    |   0   |    0    | igc_fc_none
+		 *   1   |    1    |   0   |    1    | igc_fc_rx_pause
+		 *
+		 * Are both PAUSE bits set to 1?  If so, this implies
+		 * Symmetric Flow Control is enabled at both ends.  The
+		 * ASM_DIR bits are irrelevant per the spec.
+		 *
+		 * For Symmetric Flow Control:
+		 *
+		 *   LOCAL DEVICE  |   LINK PARTNER
+		 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | Result
+		 *-------|---------|-------|---------|--------------------
+		 *   1   |   DC    |   1   |   DC    | IGC_fc_full
+		 *
+		 */
+		if ((mii_nway_adv_reg & NWAY_AR_PAUSE) &&
+		    (mii_nway_lp_ability_reg & NWAY_LPAR_PAUSE)) {
+			/* Now we need to check if the user selected RX ONLY
+			 * of pause frames.  In this case, we had to advertise
+			 * FULL flow control because we could not advertise RX
+			 * ONLY. Hence, we must now check to see if we need to
+			 * turn OFF  the TRANSMISSION of PAUSE frames.
+			 */
+			if (hw->fc.requested_mode == igc_fc_full) {
+				hw->fc.current_mode = igc_fc_full;
+				hw_dbg("Flow Control = FULL.\n");
+			} else {
+				hw->fc.current_mode = igc_fc_rx_pause;
+				hw_dbg("Flow Control = RX PAUSE frames only.\n");
+			}
+		}
+
+		/* For receiving PAUSE frames ONLY.
+		 *
+		 *   LOCAL DEVICE  |   LINK PARTNER
+		 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | Result
+		 *-------|---------|-------|---------|--------------------
+		 *   0   |    1    |   1   |    1    | igc_fc_tx_pause
+		 */
+		else if (!(mii_nway_adv_reg & NWAY_AR_PAUSE) &&
+			 (mii_nway_adv_reg & NWAY_AR_ASM_DIR) &&
+			 (mii_nway_lp_ability_reg & NWAY_LPAR_PAUSE) &&
+			 (mii_nway_lp_ability_reg & NWAY_LPAR_ASM_DIR)) {
+			hw->fc.current_mode = igc_fc_tx_pause;
+			hw_dbg("Flow Control = TX PAUSE frames only.\n");
+		}
+		/* For transmitting PAUSE frames ONLY.
+		 *
+		 *   LOCAL DEVICE  |   LINK PARTNER
+		 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | Result
+		 *-------|---------|-------|---------|--------------------
+		 *   1   |    1    |   0   |    1    | igc_fc_rx_pause
+		 */
+		else if ((mii_nway_adv_reg & NWAY_AR_PAUSE) &&
+			 (mii_nway_adv_reg & NWAY_AR_ASM_DIR) &&
+			 !(mii_nway_lp_ability_reg & NWAY_LPAR_PAUSE) &&
+			 (mii_nway_lp_ability_reg & NWAY_LPAR_ASM_DIR)) {
+			hw->fc.current_mode = igc_fc_rx_pause;
+			hw_dbg("Flow Control = RX PAUSE frames only.\n");
+		}
+		/* Per the IEEE spec, at this point flow control should be
+		 * disabled.  However, we want to consider that we could
+		 * be connected to a legacy switch that doesn't advertise
+		 * desired flow control, but can be forced on the link
+		 * partner.  So if we advertised no flow control, that is
+		 * what we will resolve to.  If we advertised some kind of
+		 * receive capability (Rx Pause Only or Full Flow Control)
+		 * and the link partner advertised none, we will configure
+		 * ourselves to enable Rx Flow Control only.  We can do
+		 * this safely for two reasons:  If the link partner really
+		 * didn't want flow control enabled, and we enable Rx, no
+		 * harm done since we won't be receiving any PAUSE frames
+		 * anyway.  If the intent on the link partner was to have
+		 * flow control enabled, then by us enabling RX only, we
+		 * can at least receive pause frames and process them.
+		 * This is a good idea because in most cases, since we are
+		 * predominantly a server NIC, more times than not we will
+		 * be asked to delay transmission of packets than asking
+		 * our link partner to pause transmission of frames.
+		 */
+		else if ((hw->fc.requested_mode == igc_fc_none) ||
+			 (hw->fc.requested_mode == igc_fc_tx_pause) ||
+			 (hw->fc.strict_ieee)) {
+			hw->fc.current_mode = igc_fc_none;
+			hw_dbg("Flow Control = NONE.\n");
+		} else {
+			hw->fc.current_mode = igc_fc_rx_pause;
+			hw_dbg("Flow Control = RX PAUSE frames only.\n");
+		}
+
+		/* Now we need to do one last check...  If we auto-
+		 * negotiated to HALF DUPLEX, flow control should not be
+		 * enabled per IEEE 802.3 spec.
+		 */
+		ret_val = hw->mac.ops.get_speed_and_duplex(hw, &speed, &duplex);
+		if (ret_val) {
+			hw_dbg("Error getting link speed and duplex\n");
+			goto out;
+		}
+
+		if (duplex == HALF_DUPLEX)
+			hw->fc.current_mode = igc_fc_none;
+
+		/* Now we call a subroutine to actually force the MAC
+		 * controller to use the correct flow control settings.
+		 */
+		ret_val = igc_force_mac_fc(hw);
+		if (ret_val) {
+			hw_dbg("Error forcing flow control settings\n");
+			goto out;
+		}
+	}
+
+out:
+	return 0;
+}
+
 /**
  * igc_get_auto_rd_done - Check for auto read completion
  * @hw: pointer to the HW structure

drivers/net/ethernet/intel/igc/igc_mac.h

@@ -15,6 +15,8 @@
 /* forward declaration */
 s32 igc_disable_pcie_master(struct igc_hw *hw);
 s32 igc_check_for_copper_link(struct igc_hw *hw);
+s32 igc_config_fc_after_link_up(struct igc_hw *hw);
+s32 igc_force_mac_fc(struct igc_hw *hw);
 void igc_init_rx_addrs(struct igc_hw *hw, u16 rar_count);
 s32 igc_setup_link(struct igc_hw *hw);
 void igc_clear_hw_cntrs_base(struct igc_hw *hw);

drivers/net/ethernet/intel/igc/igc_main.c

@@ -3403,6 +3403,25 @@ static int igc_probe(struct pci_dev *pdev,
 	netdev->min_mtu = ETH_MIN_MTU;
 	netdev->max_mtu = MAX_STD_JUMBO_FRAME_SIZE;
 
+	/* before reading the NVM, reset the controller to put the device in a
+	 * known good starting state
+	 */
+	hw->mac.ops.reset_hw(hw);
+
+	if (eth_platform_get_mac_address(&pdev->dev, hw->mac.addr)) {
+		/* copy the MAC address out of the NVM */
+		if (hw->mac.ops.read_mac_addr(hw))
+			dev_err(&pdev->dev, "NVM Read Error\n");
+	}
+
+	memcpy(netdev->dev_addr, hw->mac.addr, netdev->addr_len);
+
+	if (!is_valid_ether_addr(netdev->dev_addr)) {
+		dev_err(&pdev->dev, "Invalid MAC Address\n");
+		err = -EIO;
+		goto err_eeprom;
+	}
+
 	/* configure RXPBSIZE and TXPBSIZE */
 	wr32(IGC_RXPBS, I225_RXPBSIZE_DEFAULT);
 	wr32(IGC_TXPBS, I225_TXPBSIZE_DEFAULT);
@@ -3411,6 +3430,14 @@ static int igc_probe(struct pci_dev *pdev,
 
 	INIT_WORK(&adapter->reset_task, igc_reset_task);
 
+	/* Initialize link properties that are user-changeable */
+	adapter->fc_autoneg = true;
+	hw->mac.autoneg = true;
+	hw->phy.autoneg_advertised = 0xaf;
+
+	hw->fc.requested_mode = igc_fc_default;
+	hw->fc.current_mode = igc_fc_default;
+
 	/* reset the hardware with the new settings */
 	igc_reset(adapter);
 
@@ -3438,6 +3465,9 @@ static int igc_probe(struct pci_dev *pdev,
 
 err_register:
 	igc_release_hw_control(adapter);
+err_eeprom:
+	if (!igc_check_reset_block(hw))
+		igc_reset_phy(hw);
 err_sw_init:
 	igc_clear_interrupt_scheme(adapter);
 	iounmap(adapter->io_addr);

drivers/net/ethernet/intel/igc/igc_phy.c

@@ -3,6 +3,10 @@
 
 #include "igc_phy.h"
 
+/* forward declaration */
+static s32 igc_phy_setup_autoneg(struct igc_hw *hw);
+static s32 igc_wait_autoneg(struct igc_hw *hw);
+
 /**
  * igc_check_reset_block - Check if PHY reset is blocked
  * @hw: pointer to the HW structure
@@ -211,6 +215,336 @@ out:
 	return ret_val;
 }
 
+/**
+ * igc_copper_link_autoneg - Setup/Enable autoneg for copper link
+ * @hw: pointer to the HW structure
+ *
+ * Performs initial bounds checking on autoneg advertisement parameter, then
+ * configure to advertise the full capability.  Setup the PHY to autoneg
+ * and restart the negotiation process between the link partner.  If
+ * autoneg_wait_to_complete, then wait for autoneg to complete before exiting.
+ */
+static s32 igc_copper_link_autoneg(struct igc_hw *hw)
+{
+	struct igc_phy_info *phy = &hw->phy;
+	u16 phy_ctrl;
+	s32 ret_val;
+
+	/* Perform some bounds checking on the autoneg advertisement
+	 * parameter.
+	 */
+	phy->autoneg_advertised &= phy->autoneg_mask;
+
+	/* If autoneg_advertised is zero, we assume it was not defaulted
+	 * by the calling code so we set to advertise full capability.
+	 */
+	if (phy->autoneg_advertised == 0)
+		phy->autoneg_advertised = phy->autoneg_mask;
+
+	hw_dbg("Reconfiguring auto-neg advertisement params\n");
+	ret_val = igc_phy_setup_autoneg(hw);
+	if (ret_val) {
+		hw_dbg("Error Setting up Auto-Negotiation\n");
+		goto out;
+	}
+	hw_dbg("Restarting Auto-Neg\n");
+
+	/* Restart auto-negotiation by setting the Auto Neg Enable bit and
+	 * the Auto Neg Restart bit in the PHY control register.
+	 */
+	ret_val = phy->ops.read_reg(hw, PHY_CONTROL, &phy_ctrl);
+	if (ret_val)
+		goto out;
+
+	phy_ctrl |= (MII_CR_AUTO_NEG_EN | MII_CR_RESTART_AUTO_NEG);
+	ret_val = phy->ops.write_reg(hw, PHY_CONTROL, phy_ctrl);
+	if (ret_val)
+		goto out;
+
+	/* Does the user want to wait for Auto-Neg to complete here, or
+	 * check at a later time (for example, callback routine).
+	 */
+	if (phy->autoneg_wait_to_complete) {
+		ret_val = igc_wait_autoneg(hw);
+		if (ret_val) {
+			hw_dbg("Error while waiting for autoneg to complete\n");
+			goto out;
+		}
+	}
+
+	hw->mac.get_link_status = true;
+
+out:
+	return ret_val;
+}
+
+/**
+ * igc_wait_autoneg - Wait for auto-neg completion
+ * @hw: pointer to the HW structure
+ *
+ * Waits for auto-negotiation to complete or for the auto-negotiation time
+ * limit to expire, which ever happens first.
+ */
+static s32 igc_wait_autoneg(struct igc_hw *hw)
+{
+	u16 i, phy_status;
+	s32 ret_val = 0;
+
+	/* Break after autoneg completes or PHY_AUTO_NEG_LIMIT expires. */
+	for (i = PHY_AUTO_NEG_LIMIT; i > 0; i--) {
+		ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS, &phy_status);
+		if (ret_val)
+			break;
+		ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS, &phy_status);
+		if (ret_val)
+			break;
+		if (phy_status & MII_SR_AUTONEG_COMPLETE)
+			break;
+		msleep(100);
+	}
+
+	/* PHY_AUTO_NEG_TIME expiration doesn't guarantee auto-negotiation
+	 * has completed.
+	 */
+	return ret_val;
+}
+
+/**
+ * igc_phy_setup_autoneg - Configure PHY for auto-negotiation
+ * @hw: pointer to the HW structure
+ *
+ * Reads the MII auto-neg advertisement register and/or the 1000T control
+ * register and if the PHY is already setup for auto-negotiation, then
+ * return successful.  Otherwise, setup advertisement and flow control to
+ * the appropriate values for the wanted auto-negotiation.
+ */
+static s32 igc_phy_setup_autoneg(struct igc_hw *hw)
+{
+	struct igc_phy_info *phy = &hw->phy;
+	u16 aneg_multigbt_an_ctrl = 0;
+	u16 mii_1000t_ctrl_reg = 0;
+	u16 mii_autoneg_adv_reg;
+	s32 ret_val;
+
+	phy->autoneg_advertised &= phy->autoneg_mask;
+
+	/* Read the MII Auto-Neg Advertisement Register (Address 4). */
+	ret_val = phy->ops.read_reg(hw, PHY_AUTONEG_ADV, &mii_autoneg_adv_reg);
+	if (ret_val)
+		return ret_val;
+
+	if (phy->autoneg_mask & ADVERTISE_1000_FULL) {
+		/* Read the MII 1000Base-T Control Register (Address 9). */
+		ret_val = phy->ops.read_reg(hw, PHY_1000T_CTRL,
+					    &mii_1000t_ctrl_reg);
+		if (ret_val)
+			return ret_val;
+	}
+
+	if ((phy->autoneg_mask & ADVERTISE_2500_FULL) &&
+	    hw->phy.id == I225_I_PHY_ID) {
+		/* Read the MULTI GBT AN Control Register - reg 7.32 */
+		ret_val = phy->ops.read_reg(hw, (STANDARD_AN_REG_MASK <<
+					    MMD_DEVADDR_SHIFT) |
+					    ANEG_MULTIGBT_AN_CTRL,
+					    &aneg_multigbt_an_ctrl);
+
+		if (ret_val)
+			return ret_val;
+	}
+
+	/* Need to parse both autoneg_advertised and fc and set up
+	 * the appropriate PHY registers.  First we will parse for
+	 * autoneg_advertised software override.  Since we can advertise
+	 * a plethora of combinations, we need to check each bit
+	 * individually.
+	 */
+
+	/* First we clear all the 10/100 mb speed bits in the Auto-Neg
+	 * Advertisement Register (Address 4) and the 1000 mb speed bits in
+	 * the  1000Base-T Control Register (Address 9).
+	 */
+	mii_autoneg_adv_reg &= ~(NWAY_AR_100TX_FD_CAPS |
+				 NWAY_AR_100TX_HD_CAPS |
+				 NWAY_AR_10T_FD_CAPS   |
+				 NWAY_AR_10T_HD_CAPS);
+	mii_1000t_ctrl_reg &= ~(CR_1000T_HD_CAPS | CR_1000T_FD_CAPS);
+
+	hw_dbg("autoneg_advertised %x\n", phy->autoneg_advertised);
+
+	/* Do we want to advertise 10 Mb Half Duplex? */
+	if (phy->autoneg_advertised & ADVERTISE_10_HALF) {
+		hw_dbg("Advertise 10mb Half duplex\n");
+		mii_autoneg_adv_reg |= NWAY_AR_10T_HD_CAPS;
+	}
+
+	/* Do we want to advertise 10 Mb Full Duplex? */
+	if (phy->autoneg_advertised & ADVERTISE_10_FULL) {
+		hw_dbg("Advertise 10mb Full duplex\n");
+		mii_autoneg_adv_reg |= NWAY_AR_10T_FD_CAPS;
+	}
+
+	/* Do we want to advertise 100 Mb Half Duplex? */
+	if (phy->autoneg_advertised & ADVERTISE_100_HALF) {
+		hw_dbg("Advertise 100mb Half duplex\n");
+		mii_autoneg_adv_reg |= NWAY_AR_100TX_HD_CAPS;
+	}
+
+	/* Do we want to advertise 100 Mb Full Duplex? */
+	if (phy->autoneg_advertised & ADVERTISE_100_FULL) {
+		hw_dbg("Advertise 100mb Full duplex\n");
+		mii_autoneg_adv_reg |= NWAY_AR_100TX_FD_CAPS;
+	}
+
+	/* We do not allow the Phy to advertise 1000 Mb Half Duplex */
+	if (phy->autoneg_advertised & ADVERTISE_1000_HALF)
+		hw_dbg("Advertise 1000mb Half duplex request denied!\n");
+
+	/* Do we want to advertise 1000 Mb Full Duplex? */
+	if (phy->autoneg_advertised & ADVERTISE_1000_FULL) {
+		hw_dbg("Advertise 1000mb Full duplex\n");
+		mii_1000t_ctrl_reg |= CR_1000T_FD_CAPS;
+	}
+
+	/* We do not allow the Phy to advertise 2500 Mb Half Duplex */
+	if (phy->autoneg_advertised & ADVERTISE_2500_HALF)
+		hw_dbg("Advertise 2500mb Half duplex request denied!\n");
+
+	/* Do we want to advertise 2500 Mb Full Duplex? */
+	if (phy->autoneg_advertised & ADVERTISE_2500_FULL) {
+		hw_dbg("Advertise 2500mb Full duplex\n");
+		aneg_multigbt_an_ctrl |= CR_2500T_FD_CAPS;
+	} else {
+		aneg_multigbt_an_ctrl &= ~CR_2500T_FD_CAPS;
+	}
+
+	/* Check for a software override of the flow control settings, and
+	 * setup the PHY advertisement registers accordingly.  If
+	 * auto-negotiation is enabled, then software will have to set the
+	 * "PAUSE" bits to the correct value in the Auto-Negotiation
+	 * Advertisement Register (PHY_AUTONEG_ADV) and re-start auto-
+	 * negotiation.
+	 *
+	 * The possible values of the "fc" parameter 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:  No software override.  The flow control configuration
+	 *          in the EEPROM is used.
+	 */
+	switch (hw->fc.current_mode) {
+	case igc_fc_none:
+		/* Flow control (Rx & Tx) is completely disabled by a
+		 * software over-ride.
+		 */
+		mii_autoneg_adv_reg &= ~(NWAY_AR_ASM_DIR | NWAY_AR_PAUSE);
+		break;
+	case igc_fc_rx_pause:
+		/* Rx Flow control is enabled, and Tx Flow control is
+		 * disabled, by a software over-ride.
+		 *
+		 * 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.  Later
+		 * (in igc_config_fc_after_link_up) we will disable the
+		 * hw's ability to send PAUSE frames.
+		 */
+		mii_autoneg_adv_reg |= (NWAY_AR_ASM_DIR | NWAY_AR_PAUSE);
+		break;
+	case igc_fc_tx_pause:
+		/* Tx Flow control is enabled, and Rx Flow control is
+		 * disabled, by a software over-ride.
+		 */
+		mii_autoneg_adv_reg |= NWAY_AR_ASM_DIR;
+		mii_autoneg_adv_reg &= ~NWAY_AR_PAUSE;
+		break;
+	case igc_fc_full:
+		/* Flow control (both Rx and Tx) is enabled by a software
+		 * over-ride.
+		 */
+		mii_autoneg_adv_reg |= (NWAY_AR_ASM_DIR | NWAY_AR_PAUSE);
+		break;
+	default:
+		hw_dbg("Flow control param set incorrectly\n");
+		return -IGC_ERR_CONFIG;
+	}
+
+	ret_val = phy->ops.write_reg(hw, PHY_AUTONEG_ADV, mii_autoneg_adv_reg);
+	if (ret_val)
+		return ret_val;
+
+	hw_dbg("Auto-Neg Advertising %x\n", mii_autoneg_adv_reg);
+
+	if (phy->autoneg_mask & ADVERTISE_1000_FULL)
+		ret_val = phy->ops.write_reg(hw, PHY_1000T_CTRL,
+					     mii_1000t_ctrl_reg);
+
+	if ((phy->autoneg_mask & ADVERTISE_2500_FULL) &&
+	    hw->phy.id == I225_I_PHY_ID)
+		ret_val = phy->ops.write_reg(hw,
+					     (STANDARD_AN_REG_MASK <<
+					     MMD_DEVADDR_SHIFT) |
+					     ANEG_MULTIGBT_AN_CTRL,
+					     aneg_multigbt_an_ctrl);
+
+	return ret_val;
+}
+
+/**
+ * igc_setup_copper_link - Configure copper link settings
+ * @hw: pointer to the HW structure
+ *
+ * Calls the appropriate function to configure the link for auto-neg or forced
+ * speed and duplex.  Then we check for link, once link is established calls
+ * to configure collision distance and flow control are called.  If link is
+ * not established, we return -IGC_ERR_PHY (-2).
+ */
+s32 igc_setup_copper_link(struct igc_hw *hw)
+{
+	s32 ret_val = 0;
+	bool link;
+
+	if (hw->mac.autoneg) {
+		/* Setup autoneg and flow control advertisement and perform
+		 * autonegotiation.
+		 */
+		ret_val = igc_copper_link_autoneg(hw);
+		if (ret_val)
+			goto out;
+	} else {
+		/* PHY will be set to 10H, 10F, 100H or 100F
+		 * depending on user settings.
+		 */
+		hw_dbg("Forcing Speed and Duplex\n");
+		ret_val = hw->phy.ops.force_speed_duplex(hw);
+		if (ret_val) {
+			hw_dbg("Error Forcing Speed and Duplex\n");
+			goto out;
+		}
+	}
+
+	/* Check link status. Wait up to 100 microseconds for link to become
+	 * valid.
+	 */
+	ret_val = igc_phy_has_link(hw, COPPER_LINK_UP_LIMIT, 10, &link);
+	if (ret_val)
+		goto out;
+
+	if (link) {
+		hw_dbg("Valid link established!!!\n");
+		igc_config_collision_dist(hw);
+		ret_val = igc_config_fc_after_link_up(hw);
+	} else {
+		hw_dbg("Unable to establish link!!!\n");
+	}
+
+out:
+	return ret_val;
+}
+
 /**
  * igc_read_phy_reg_mdic - Read MDI control register
  * @hw: pointer to the HW structure

drivers/net/ethernet/intel/igc/igc_phy.h

@@ -12,6 +12,7 @@ s32 igc_get_phy_id(struct igc_hw *hw);
 s32 igc_phy_has_link(struct igc_hw *hw, u32 iterations,
 		     u32 usec_interval, bool *success);
 s32 igc_check_downshift(struct igc_hw *hw);
+s32 igc_setup_copper_link(struct igc_hw *hw);
 void igc_power_up_phy_copper(struct igc_hw *hw);
 void igc_power_down_phy_copper(struct igc_hw *hw);
 s32 igc_write_phy_reg_gpy(struct igc_hw *hw, u32 offset, u16 data);