/*      $OpenBSD: igc_phy.c,v 1.3 2023/02/03 11:31:52 mbuhl Exp $       */
/*-
 * Copyright 2021 Intel Corp
 * Copyright 2021 Rubicon Communications, LLC (Netgate)
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <dev/pci/igc_api.h>

/**
 *  igc_init_phy_ops_generic - Initialize PHY function pointers
 *  @hw: pointer to the HW structure
 *
 *  Setups up the function pointers to no-op functions
 **/
void
igc_init_phy_ops_generic(struct igc_hw *hw)
{
        struct igc_phy_info *phy = &hw->phy;
        DEBUGFUNC("igc_init_phy_ops_generic");

        /* Initialize function pointers */
        phy->ops.init_params = igc_null_ops_generic;
        phy->ops.acquire = igc_null_ops_generic;
        phy->ops.check_reset_block = igc_null_ops_generic;
        phy->ops.force_speed_duplex = igc_null_ops_generic;
        phy->ops.get_info = igc_null_ops_generic;
        phy->ops.set_page = igc_null_set_page;
        phy->ops.read_reg = igc_null_read_reg;
        phy->ops.read_reg_locked = igc_null_read_reg;
        phy->ops.read_reg_page = igc_null_read_reg;
        phy->ops.release = igc_null_phy_generic;
        phy->ops.reset = igc_null_ops_generic;
        phy->ops.set_d0_lplu_state = igc_null_lplu_state;
        phy->ops.set_d3_lplu_state = igc_null_lplu_state;
        phy->ops.write_reg = igc_null_write_reg;
        phy->ops.write_reg_locked = igc_null_write_reg;
        phy->ops.write_reg_page = igc_null_write_reg;
        phy->ops.power_up = igc_null_phy_generic;
        phy->ops.power_down = igc_null_phy_generic;
}

/**
 *  igc_null_set_page - No-op function, return 0
 *  @hw: pointer to the HW structure
 *  @data: dummy variable
 **/
int
igc_null_set_page(struct igc_hw IGC_UNUSEDARG *hw, uint16_t IGC_UNUSEDARG data)
{
        DEBUGFUNC("igc_null_set_page");
        return IGC_SUCCESS;
}

/**
 *  igc_null_read_reg - No-op function, return 0
 *  @hw: pointer to the HW structure
 *  @offset: dummy variable
 *  @data: dummy variable
 **/
int
igc_null_read_reg(struct igc_hw IGC_UNUSEDARG *hw, 
    uint32_t IGC_UNUSEDARG offset, uint16_t IGC_UNUSEDARG *data)
{
        DEBUGFUNC("igc_null_read_reg");
        return IGC_SUCCESS;
}

/**
 *  igc_null_phy_generic - No-op function, return void
 *  @hw: pointer to the HW structure
 **/
void
igc_null_phy_generic(struct igc_hw IGC_UNUSEDARG *hw)
{
        DEBUGFUNC("igc_null_phy_generic");
        return;
}

/**
 *  igc_null_lplu_state - No-op function, return 0
 *  @hw: pointer to the HW structure
 *  @active: dummy variable
 **/
int
igc_null_lplu_state(struct igc_hw IGC_UNUSEDARG *hw, bool IGC_UNUSEDARG active)
{
        DEBUGFUNC("igc_null_lplu_state");
        return IGC_SUCCESS;
}

/**
 *  igc_null_write_reg - No-op function, return 0
 *  @hw: pointer to the HW structure
 *  @offset: dummy variable
 *  @data: dummy variable
 **/
int
igc_null_write_reg(struct igc_hw IGC_UNUSEDARG *hw,
    uint32_t IGC_UNUSEDARG offset, uint16_t IGC_UNUSEDARG data)
{
        DEBUGFUNC("igc_null_write_reg");
        return IGC_SUCCESS;
}

/**
 *  igc_check_reset_block_generic - Check if PHY reset is blocked
 *  @hw: pointer to the HW structure
 *
 *  Read the PHY management control register and check whether a PHY reset
 *  is blocked.  If a reset is not blocked return IGC_SUCCESS, otherwise
 *  return IGC_BLK_PHY_RESET (12).
 **/
int
igc_check_reset_block_generic(struct igc_hw *hw)
{
        uint32_t manc;

        DEBUGFUNC("igc_check_reset_block");

        manc = IGC_READ_REG(hw, IGC_MANC);

        return (manc & IGC_MANC_BLK_PHY_RST_ON_IDE) ?
            IGC_BLK_PHY_RESET : IGC_SUCCESS;
}

/**
 *  igc_get_phy_id - Retrieve the PHY ID and revision
 *  @hw: pointer to the HW structure
 *
 *  Reads the PHY registers and stores the PHY ID and possibly the PHY
 *  revision in the hardware structure.
 **/
int
igc_get_phy_id(struct igc_hw *hw)
{
        struct igc_phy_info *phy = &hw->phy;
        uint16_t phy_id;
        int ret_val = IGC_SUCCESS;

        DEBUGFUNC("igc_get_phy_id");

        if (!phy->ops.read_reg)
                return IGC_SUCCESS;

        ret_val = phy->ops.read_reg(hw, PHY_ID1, &phy_id);
        if (ret_val)
                return ret_val;

        phy->id = (uint32_t)(phy_id << 16);
        DELAY(200);
        ret_val = phy->ops.read_reg(hw, PHY_ID2, &phy_id);
        if (ret_val)
                return ret_val;

        phy->id |= (uint32_t)(phy_id & PHY_REVISION_MASK);
        phy->revision = (uint32_t)(phy_id & ~PHY_REVISION_MASK);

        return IGC_SUCCESS;
}

/**
 *  igc_read_phy_reg_mdic - Read MDI control register
 *  @hw: pointer to the HW structure
 *  @offset: register offset to be read
 *  @data: pointer to the read data
 *
 *  Reads the MDI control register in the PHY at offset and stores the
 *  information read to data.
 **/
int
igc_read_phy_reg_mdic(struct igc_hw *hw, uint32_t offset, uint16_t *data)
{
        struct igc_phy_info *phy = &hw->phy;
        uint32_t i, mdic = 0;

        DEBUGFUNC("igc_read_phy_reg_mdic");

        if (offset > MAX_PHY_REG_ADDRESS) {
                DEBUGOUT1("PHY Address %d is out of range\n", offset);
                return -IGC_ERR_PARAM;
        }

        /* Set up Op-code, Phy Address, and register offset in the MDI
         * Control register.  The MAC will take care of interfacing with the
         * PHY to retrieve the desired data.
         */
        mdic = ((offset << IGC_MDIC_REG_SHIFT) |
            (phy->addr << IGC_MDIC_PHY_SHIFT) | (IGC_MDIC_OP_READ));

        IGC_WRITE_REG(hw, IGC_MDIC, mdic);

        /* Poll the ready bit to see if the MDI read completed
         * Increasing the time out as testing showed failures with
         * the lower time out
         */
        for (i = 0; i < (IGC_GEN_POLL_TIMEOUT * 3); i++) {
                DELAY(50);
                mdic = IGC_READ_REG(hw, IGC_MDIC);
                if (mdic & IGC_MDIC_READY)
                        break;
        }
        if (!(mdic & IGC_MDIC_READY)) {
                DEBUGOUT("MDI Read did not complete\n");
                return -IGC_ERR_PHY;
        }
        if (mdic & IGC_MDIC_ERROR) {
                DEBUGOUT("MDI Error\n");
                return -IGC_ERR_PHY;
        }
        if (((mdic & IGC_MDIC_REG_MASK) >> IGC_MDIC_REG_SHIFT) != offset) {
                DEBUGOUT2("MDI Read offset error - requested %d, returned %d\n",
                    offset, (mdic & IGC_MDIC_REG_MASK) >> IGC_MDIC_REG_SHIFT);
                return -IGC_ERR_PHY;
        }
        *data = (uint16_t)mdic;

        return IGC_SUCCESS;
}

/**
 *  igc_write_phy_reg_mdic - Write MDI control register
 *  @hw: pointer to the HW structure
 *  @offset: register offset to write to
 *  @data: data to write to register at offset
 *
 *  Writes data to MDI control register in the PHY at offset.
 **/
int
igc_write_phy_reg_mdic(struct igc_hw *hw, uint32_t offset, uint16_t data)
{
        struct igc_phy_info *phy = &hw->phy;
        uint32_t i, mdic = 0;

        DEBUGFUNC("igc_write_phy_reg_mdic");

        if (offset > MAX_PHY_REG_ADDRESS) {
                DEBUGOUT1("PHY Address %d is out of range\n", offset);
                return -IGC_ERR_PARAM;
        }

        /* Set up Op-code, Phy Address, and register offset in the MDI
         * Control register.  The MAC will take care of interfacing with the
         * PHY to retrieve the desired data.
         */
        mdic = (((uint32_t)data) | (offset << IGC_MDIC_REG_SHIFT) |
            (phy->addr << IGC_MDIC_PHY_SHIFT) | (IGC_MDIC_OP_WRITE));

        IGC_WRITE_REG(hw, IGC_MDIC, mdic);

        /* Poll the ready bit to see if the MDI read completed
         * Increasing the time out as testing showed failures with
         * the lower time out
         */
        for (i = 0; i < (IGC_GEN_POLL_TIMEOUT * 3); i++) {
                DELAY(50);
                mdic = IGC_READ_REG(hw, IGC_MDIC);
                if (mdic & IGC_MDIC_READY)
                        break;
        }
        if (!(mdic & IGC_MDIC_READY)) {
                DEBUGOUT("MDI Write did not complete\n");
                return -IGC_ERR_PHY;
        }
        if (mdic & IGC_MDIC_ERROR) {
                DEBUGOUT("MDI Error\n");
                return -IGC_ERR_PHY;
        }
        if (((mdic & IGC_MDIC_REG_MASK) >> IGC_MDIC_REG_SHIFT) != offset)
                return -IGC_ERR_PHY;

        return IGC_SUCCESS;
}

/**
 *  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.
 **/
int
igc_phy_setup_autoneg(struct igc_hw *hw)
{
        struct igc_phy_info *phy = &hw->phy;
        uint16_t mii_autoneg_adv_reg;
        uint16_t mii_1000t_ctrl_reg = 0;
        uint16_t aneg_multigbt_an_ctrl = 0;
        int ret_val;

        DEBUGFUNC("igc_phy_setup_autoneg");

        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) {
                /* 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);

        DEBUGOUT1("autoneg_advertised %x\n", phy->autoneg_advertised);

        /* Do we want to advertise 10 Mb Half Duplex? */
        if (phy->autoneg_advertised & ADVERTISE_10_HALF) {
                DEBUGOUT("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) {
                DEBUGOUT("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) {
                DEBUGOUT("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) {
                DEBUGOUT("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)
                DEBUGOUT("Advertise 1000mb Half duplex request denied!\n");

        /* Do we want to advertise 1000 Mb Full Duplex? */
        if (phy->autoneg_advertised & ADVERTISE_1000_FULL) {
                DEBUGOUT("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)
                DEBUGOUT("Advertise 2500mb Half duplex request denied!\n");

        /* Do we want to advertise 2500 Mb Full Duplex? */
        if (phy->autoneg_advertised & ADVERTISE_2500_FULL) {
                DEBUGOUT("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:
                DEBUGOUT("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;

        DEBUGOUT1("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)
                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_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.
 **/
int
igc_copper_link_autoneg(struct igc_hw *hw)
{
        struct igc_phy_info *phy = &hw->phy;
        uint16_t phy_ctrl;
        int ret_val;

        DEBUGFUNC("igc_copper_link_autoneg");

        /* 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)
                phy->autoneg_advertised = phy->autoneg_mask;

        DEBUGOUT("Reconfiguring auto-neg advertisement params\n");
        ret_val = igc_phy_setup_autoneg(hw);
        if (ret_val) {
                DEBUGOUT("Error Setting up Auto-Negotiation\n");
                return ret_val;
        }
        DEBUGOUT("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)
                return ret_val;

        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)
                return ret_val;

        /* 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)
                        return ret_val;
        }

        hw->mac.get_link_status = true;

        return ret_val;
}

/**
 *  igc_setup_copper_link_generic - 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).
 **/
int
igc_setup_copper_link_generic(struct igc_hw *hw)
{
        int ret_val;
        bool link;

        DEBUGFUNC("igc_setup_copper_link_generic");

        if (hw->mac.autoneg) {
                /* Setup autoneg and flow control advertisement and perform
                 * autonegotiation.
                 */
                ret_val = igc_copper_link_autoneg(hw);
                if (ret_val)
                        return ret_val;
        } else {
                /* PHY will be set to 10H, 10F, 100H or 100F
                 * depending on user settings.
                 */
                DEBUGOUT("Forcing Speed and Duplex\n");
                ret_val = hw->phy.ops.force_speed_duplex(hw);
                if (ret_val) {
                        DEBUGOUT("Error Forcing Speed and Duplex\n");
                        return ret_val;
                }
        }

        /* Check link status. Wait up to 100 microseconds for link to become
         * valid.
         */
        ret_val = igc_phy_has_link_generic(hw, COPPER_LINK_UP_LIMIT, 10,
            &link);
        if (ret_val)
                return ret_val;

        if (link) {
                DEBUGOUT("Valid link established!!!\n");
                hw->mac.ops.config_collision_dist(hw);
                ret_val = igc_config_fc_after_link_up_generic(hw);
        } else
                DEBUGOUT("Unable to establish link!!!\n");

        return ret_val;
}

/**
 *  igc_check_downshift_generic - Checks whether a downshift in speed occurred
 *  @hw: pointer to the HW structure
 *
 *  Success returns 0, Failure returns 1
 *
 *  A downshift is detected by querying the PHY link health.
 **/
int
igc_check_downshift_generic(struct igc_hw *hw)
{
        struct igc_phy_info *phy = &hw->phy;
        int ret_val;

        DEBUGFUNC("igc_check_downshift_generic");

        switch (phy->type) {
        case igc_phy_i225:
        default:
                /* speed downshift not supported */
                phy->speed_downgraded = false;
                return IGC_SUCCESS;
        }

        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.
 **/
int
igc_wait_autoneg(struct igc_hw *hw)
{
        uint16_t i, phy_status;
        int ret_val = IGC_SUCCESS;

        DEBUGFUNC("igc_wait_autoneg");

        if (!hw->phy.ops.read_reg)
                return IGC_SUCCESS;

        /* 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;
                msec_delay(100);
        }

        /* PHY_AUTO_NEG_TIME expiration doesn't guarantee auto-negotiation
         * has completed.
         */
        return ret_val;
}

/**
 *  igc_phy_has_link_generic - Polls PHY for link
 *  @hw: pointer to the HW structure
 *  @iterations: number of times to poll for link
 *  @usec_interval: delay between polling attempts
 *  @success: pointer to whether polling was successful or not
 *
 *  Polls the PHY status register for link, 'iterations' number of times.
 **/
int
igc_phy_has_link_generic(struct igc_hw *hw, uint32_t iterations,
    uint32_t usec_interval, bool *success)
{
        uint16_t i, phy_status;
        int ret_val = IGC_SUCCESS;

        DEBUGFUNC("igc_phy_has_link_generic");

        if (!hw->phy.ops.read_reg)
                return IGC_SUCCESS;

        for (i = 0; i < iterations; i++) {
                /* Some PHYs require the PHY_STATUS register to be read
                 * twice due to the link bit being sticky.  No harm doing
                 * it across the board.
                 */
                ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS, &phy_status);
                if (ret_val) {
                        /* If the first read fails, another entity may have
                         * ownership of the resources, wait and try again to
                         * see if they have relinquished the resources yet.
                         */
                        if (usec_interval >= 1000)
                                msec_delay(usec_interval/1000);
                        else
                                DELAY(usec_interval);
                }
                ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS, &phy_status);
                if (ret_val)
                        break;
                if (phy_status & MII_SR_LINK_STATUS)
                        break;
                if (usec_interval >= 1000)
                        msec_delay(usec_interval/1000);
                else
                        DELAY(usec_interval);
        }

        *success = (i < iterations);

        return ret_val;
}

/**
 *  igc_phy_hw_reset_generic - PHY hardware reset
 *  @hw: pointer to the HW structure
 *
 *  Verify the reset block is not blocking us from resetting.  Acquire
 *  semaphore (if necessary) and read/set/write the device control reset
 *  bit in the PHY.  Wait the appropriate delay time for the device to
 *  reset and release the semaphore (if necessary).
 **/
int
igc_phy_hw_reset_generic(struct igc_hw *hw)
{
        struct igc_phy_info *phy = &hw->phy;
        uint32_t ctrl, timeout = 10000, phpm = 0;
        int ret_val;

        DEBUGFUNC("igc_phy_hw_reset_generic");

        if (phy->ops.check_reset_block) {
                ret_val = phy->ops.check_reset_block(hw);
                if (ret_val)
                        return IGC_SUCCESS;
        }

        ret_val = phy->ops.acquire(hw);
        if (ret_val)
                return ret_val;

        phpm = IGC_READ_REG(hw, IGC_I225_PHPM);

        ctrl = IGC_READ_REG(hw, IGC_CTRL);
        IGC_WRITE_REG(hw, IGC_CTRL, ctrl | IGC_CTRL_PHY_RST);
        IGC_WRITE_FLUSH(hw);

        DELAY(phy->reset_delay_us);

        IGC_WRITE_REG(hw, IGC_CTRL, ctrl);
        IGC_WRITE_FLUSH(hw);

        DELAY(150);

        do {
                phpm = IGC_READ_REG(hw, IGC_I225_PHPM);
                timeout--;
                DELAY(1);
        } while (!(phpm & IGC_I225_PHPM_RST_COMPL) && timeout);

        if (!timeout)
                DEBUGOUT("Timeout expired after a phy reset\n");

        phy->ops.release(hw);

        return ret_val;
}

/**
 * igc_power_up_phy_copper - Restore copper link in case of PHY power down
 * @hw: pointer to the HW structure
 *
 * In the case of a PHY power down to save power, or to turn off link during a
 * driver unload, or wake on lan is not enabled, restore the link to previous
 * settings.
 **/
void
igc_power_up_phy_copper(struct igc_hw *hw)
{
        uint16_t mii_reg = 0;

        /* The PHY will retain its settings across a power down/up cycle */
        hw->phy.ops.read_reg(hw, PHY_CONTROL, &mii_reg);
        mii_reg &= ~MII_CR_POWER_DOWN;
        hw->phy.ops.write_reg(hw, PHY_CONTROL, mii_reg);
        DELAY(300);
}

/**
 * igc_power_down_phy_copper - Restore copper link in case of PHY power down
 * @hw: pointer to the HW structure
 *
 * In the case of a PHY power down to save power, or to turn off link during a
 * driver unload, or wake on lan is not enabled, restore the link to previous
 * settings.
 **/
void
igc_power_down_phy_copper(struct igc_hw *hw)
{
        uint16_t mii_reg = 0;

        /* The PHY will retain its settings across a power down/up cycle */
        hw->phy.ops.read_reg(hw, PHY_CONTROL, &mii_reg);
        mii_reg |= MII_CR_POWER_DOWN;
        hw->phy.ops.write_reg(hw, PHY_CONTROL, mii_reg);
        msec_delay(1);
}

/**
 *  igc_write_phy_reg_gpy - Write GPY PHY register
 *  @hw: pointer to the HW structure
 *  @offset: register offset to write to
 *  @data: data to write at register offset
 *
 *  Acquires semaphore, if necessary, then writes the data to PHY register
 *  at the offset.  Release any acquired semaphores before exiting.
 **/
int
igc_write_phy_reg_gpy(struct igc_hw *hw, uint32_t offset, uint16_t data)
{
        uint8_t dev_addr = (offset & GPY_MMD_MASK) >> GPY_MMD_SHIFT;
        int ret_val;

        DEBUGFUNC("igc_write_phy_reg_gpy");

        offset = offset & GPY_REG_MASK;

        if (!dev_addr) {
                ret_val = hw->phy.ops.acquire(hw);
                if (ret_val)
                        return ret_val;
                ret_val = igc_write_phy_reg_mdic(hw, offset, data);
                if (ret_val)
                        return ret_val;
                hw->phy.ops.release(hw);
        } else {
                ret_val = igc_write_xmdio_reg(hw, (uint16_t)offset, dev_addr,
                    data);
        }

        return ret_val;
}

/**
 *  igc_read_phy_reg_gpy - Read GPY PHY register
 *  @hw: pointer to the HW structure
 *  @offset: lower half is register offset to read to
 *     upper half is MMD to use.
 *  @data: data to read at register offset
 *
 *  Acquires semaphore, if necessary, then reads the data in the PHY register
 *  at the offset.  Release any acquired semaphores before exiting.
 **/
int
igc_read_phy_reg_gpy(struct igc_hw *hw, uint32_t offset, uint16_t *data)
{
        uint8_t dev_addr = (offset & GPY_MMD_MASK) >> GPY_MMD_SHIFT;
        int ret_val;

        DEBUGFUNC("igc_read_phy_reg_gpy");

        offset = offset & GPY_REG_MASK;

        if (!dev_addr) {
                ret_val = hw->phy.ops.acquire(hw);
                if (ret_val)
                        return ret_val;
                ret_val = igc_read_phy_reg_mdic(hw, offset, data);
                if (ret_val)
                        return ret_val;
                hw->phy.ops.release(hw);
        } else {
                ret_val = igc_read_xmdio_reg(hw, (uint16_t)offset, dev_addr,
                    data);
        }

        return ret_val;
}

/**
 *  __igc_access_xmdio_reg - Read/write XMDIO register
 *  @hw: pointer to the HW structure
 *  @address: XMDIO address to program
 *  @dev_addr: device address to program
 *  @data: pointer to value to read/write from/to the XMDIO address
 *  @read: boolean flag to indicate read or write
 **/
int
__igc_access_xmdio_reg(struct igc_hw *hw, uint16_t address, uint8_t dev_addr,
    uint16_t *data, bool read)
{
        int ret_val;

        DEBUGFUNC("__igc_access_xmdio_reg");

        ret_val = hw->phy.ops.write_reg(hw, IGC_MMDAC, dev_addr);
        if (ret_val)
                return ret_val;

        ret_val = hw->phy.ops.write_reg(hw, IGC_MMDAAD, address);
        if (ret_val)
                return ret_val;

        ret_val = hw->phy.ops.write_reg(hw, IGC_MMDAC, IGC_MMDAC_FUNC_DATA |
            dev_addr);
        if (ret_val)
                return ret_val;

        if (read)
                ret_val = hw->phy.ops.read_reg(hw, IGC_MMDAAD, data);
        else
                ret_val = hw->phy.ops.write_reg(hw, IGC_MMDAAD, *data);
        if (ret_val)
                return ret_val;

        /* Recalibrate the device back to 0 */
        ret_val = hw->phy.ops.write_reg(hw, IGC_MMDAC, 0);
        if (ret_val)
                return ret_val;

        return ret_val;
}

/**
 *  igc_read_xmdio_reg - Read XMDIO register
 *  @hw: pointer to the HW structure
 *  @addr: XMDIO address to program
 *  @dev_addr: device address to program
 *  @data: value to be read from the EMI address
 **/
int
igc_read_xmdio_reg(struct igc_hw *hw, uint16_t addr, uint8_t dev_addr,
    uint16_t *data)
{
        DEBUGFUNC("igc_read_xmdio_reg");

        return __igc_access_xmdio_reg(hw, addr, dev_addr, data, true);
}

/**
 *  igc_write_xmdio_reg - Write XMDIO register
 *  @hw: pointer to the HW structure
 *  @addr: XMDIO address to program
 *  @dev_addr: device address to program
 *  @data: value to be written to the XMDIO address
 **/
int
igc_write_xmdio_reg(struct igc_hw *hw, uint16_t addr, uint8_t dev_addr,
    uint16_t data)
{
        DEBUGFUNC("igc_write_xmdio_reg");

        return __igc_access_xmdio_reg(hw, addr, dev_addr, &data, false);
}