/******************************************************************************
  SPDX-License-Identifier: BSD-3-Clause

  Copyright (c) 2001-2020, Intel Corporation
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:

   1. Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.

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      contributors may be used to endorse or promote products derived from
      this software without specific prior written permission.

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  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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/*
 * 82543GC Gigabit Ethernet Controller (Fiber)
 * 82543GC Gigabit Ethernet Controller (Copper)
 * 82544EI Gigabit Ethernet Controller (Copper)
 * 82544EI Gigabit Ethernet Controller (Fiber)
 * 82544GC Gigabit Ethernet Controller (Copper)
 * 82544GC Gigabit Ethernet Controller (LOM)
 */

#include "e1000_api.h"

static s32  e1000_init_phy_params_82543(struct e1000_hw *hw);
static s32  e1000_init_nvm_params_82543(struct e1000_hw *hw);
static s32  e1000_init_mac_params_82543(struct e1000_hw *hw);
static s32  e1000_read_phy_reg_82543(struct e1000_hw *hw, u32 offset,
                                     u16 *data);
static s32  e1000_write_phy_reg_82543(struct e1000_hw *hw, u32 offset,
                                      u16 data);
static s32  e1000_phy_force_speed_duplex_82543(struct e1000_hw *hw);
static s32  e1000_phy_hw_reset_82543(struct e1000_hw *hw);
static s32  e1000_reset_hw_82543(struct e1000_hw *hw);
static s32  e1000_init_hw_82543(struct e1000_hw *hw);
static s32  e1000_setup_link_82543(struct e1000_hw *hw);
static s32  e1000_setup_copper_link_82543(struct e1000_hw *hw);
static s32  e1000_setup_fiber_link_82543(struct e1000_hw *hw);
static s32  e1000_check_for_copper_link_82543(struct e1000_hw *hw);
static s32  e1000_check_for_fiber_link_82543(struct e1000_hw *hw);
static s32  e1000_led_on_82543(struct e1000_hw *hw);
static s32  e1000_led_off_82543(struct e1000_hw *hw);
static void e1000_write_vfta_82543(struct e1000_hw *hw, u32 offset,
                                   u32 value);
static void e1000_clear_hw_cntrs_82543(struct e1000_hw *hw);
static s32  e1000_config_mac_to_phy_82543(struct e1000_hw *hw);
static bool e1000_init_phy_disabled_82543(struct e1000_hw *hw);
static void e1000_lower_mdi_clk_82543(struct e1000_hw *hw, u32 *ctrl);
static s32  e1000_polarity_reversal_workaround_82543(struct e1000_hw *hw);
static void e1000_raise_mdi_clk_82543(struct e1000_hw *hw, u32 *ctrl);
static u16  e1000_shift_in_mdi_bits_82543(struct e1000_hw *hw);
static void e1000_shift_out_mdi_bits_82543(struct e1000_hw *hw, u32 data,
                                           u16 count);
static bool e1000_tbi_compatibility_enabled_82543(struct e1000_hw *hw);
static void e1000_set_tbi_sbp_82543(struct e1000_hw *hw, bool state);
static s32  e1000_read_mac_addr_82543(struct e1000_hw *hw);


/**
 *  e1000_init_phy_params_82543 - Init PHY func ptrs.
 *  @hw: pointer to the HW structure
 **/
static s32 e1000_init_phy_params_82543(struct e1000_hw *hw)
{
        struct e1000_phy_info *phy = &hw->phy;
        s32 ret_val = E1000_SUCCESS;

        DEBUGFUNC("e1000_init_phy_params_82543");

        if (hw->phy.media_type != e1000_media_type_copper) {
                phy->type = e1000_phy_none;
                goto out;
        } else {
                phy->ops.power_up = e1000_power_up_phy_copper;
                phy->ops.power_down = e1000_power_down_phy_copper;
        }

        phy->addr               = 1;
        phy->autoneg_mask       = AUTONEG_ADVERTISE_SPEED_DEFAULT;
        phy->reset_delay_us     = 10000;
        phy->type               = e1000_phy_m88;

        /* Function Pointers */
        phy->ops.check_polarity = e1000_check_polarity_m88;
        phy->ops.commit         = e1000_phy_sw_reset_generic;
        phy->ops.force_speed_duplex = e1000_phy_force_speed_duplex_82543;
        phy->ops.get_cable_length = e1000_get_cable_length_m88;
        phy->ops.get_cfg_done   = e1000_get_cfg_done_generic;
        phy->ops.read_reg       = (hw->mac.type == e1000_82543)
                                  ? e1000_read_phy_reg_82543
                                  : e1000_read_phy_reg_m88;
        phy->ops.reset          = (hw->mac.type == e1000_82543)
                                  ? e1000_phy_hw_reset_82543
                                  : e1000_phy_hw_reset_generic;
        phy->ops.write_reg      = (hw->mac.type == e1000_82543)
                                  ? e1000_write_phy_reg_82543
                                  : e1000_write_phy_reg_m88;
        phy->ops.get_info       = e1000_get_phy_info_m88;

        /*
         * The external PHY of the 82543 can be in a funky state.
         * Resetting helps us read the PHY registers for acquiring
         * the PHY ID.
         */
        if (!e1000_init_phy_disabled_82543(hw)) {
                ret_val = phy->ops.reset(hw);
                if (ret_val) {
                        DEBUGOUT("Resetting PHY during init failed.\n");
                        goto out;
                }
                msec_delay(20);
        }

        ret_val = e1000_get_phy_id(hw);
        if (ret_val)
                goto out;

        /* Verify phy id */
        switch (hw->mac.type) {
        case e1000_82543:
                if (phy->id != M88E1000_E_PHY_ID) {
                        ret_val = -E1000_ERR_PHY;
                        goto out;
                }
                break;
        case e1000_82544:
                if (phy->id != M88E1000_I_PHY_ID) {
                        ret_val = -E1000_ERR_PHY;
                        goto out;
                }
                break;
        default:
                ret_val = -E1000_ERR_PHY;
                goto out;
                break;
        }

out:
        return ret_val;
}

/**
 *  e1000_init_nvm_params_82543 - Init NVM func ptrs.
 *  @hw: pointer to the HW structure
 **/
static s32 e1000_init_nvm_params_82543(struct e1000_hw *hw)
{
        struct e1000_nvm_info *nvm = &hw->nvm;

        DEBUGFUNC("e1000_init_nvm_params_82543");

        nvm->type               = e1000_nvm_eeprom_microwire;
        nvm->word_size          = 64;
        nvm->delay_usec         = 50;
        nvm->address_bits       =  6;
        nvm->opcode_bits        =  3;

        /* Function Pointers */
        nvm->ops.read           = e1000_read_nvm_microwire;
        nvm->ops.update         = e1000_update_nvm_checksum_generic;
        nvm->ops.valid_led_default = e1000_valid_led_default_generic;
        nvm->ops.validate       = e1000_validate_nvm_checksum_generic;
        nvm->ops.write          = e1000_write_nvm_microwire;

        return E1000_SUCCESS;
}

/**
 *  e1000_init_mac_params_82543 - Init MAC func ptrs.
 *  @hw: pointer to the HW structure
 **/
static s32 e1000_init_mac_params_82543(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;

        DEBUGFUNC("e1000_init_mac_params_82543");

        /* Set media type */
        switch (hw->device_id) {
        case E1000_DEV_ID_82543GC_FIBER:
        case E1000_DEV_ID_82544EI_FIBER:
                hw->phy.media_type = e1000_media_type_fiber;
                break;
        default:
                hw->phy.media_type = e1000_media_type_copper;
                break;
        }

        /* Set mta register count */
        mac->mta_reg_count = 128;
        /* Set rar entry count */
        mac->rar_entry_count = E1000_RAR_ENTRIES;

        /* Function pointers */

        /* bus type/speed/width */
        mac->ops.get_bus_info = e1000_get_bus_info_pci_generic;
        /* function id */
        mac->ops.set_lan_id = e1000_set_lan_id_multi_port_pci;
        /* reset */
        mac->ops.reset_hw = e1000_reset_hw_82543;
        /* hw initialization */
        mac->ops.init_hw = e1000_init_hw_82543;
        /* link setup */
        mac->ops.setup_link = e1000_setup_link_82543;
        /* physical interface setup */
        mac->ops.setup_physical_interface =
                (hw->phy.media_type == e1000_media_type_copper)
                 ? e1000_setup_copper_link_82543 : e1000_setup_fiber_link_82543;
        /* check for link */
        mac->ops.check_for_link =
                (hw->phy.media_type == e1000_media_type_copper)
                 ? e1000_check_for_copper_link_82543
                 : e1000_check_for_fiber_link_82543;
        /* link info */
        mac->ops.get_link_up_info =
                (hw->phy.media_type == e1000_media_type_copper)
                 ? e1000_get_speed_and_duplex_copper_generic
                 : e1000_get_speed_and_duplex_fiber_serdes_generic;
        /* multicast address update */
        mac->ops.update_mc_addr_list = e1000_update_mc_addr_list_generic;
        /* writing VFTA */
        mac->ops.write_vfta = e1000_write_vfta_82543;
        /* clearing VFTA */
        mac->ops.clear_vfta = e1000_clear_vfta_generic;
        /* read mac address */
        mac->ops.read_mac_addr = e1000_read_mac_addr_82543;
        /* turn on/off LED */
        mac->ops.led_on = e1000_led_on_82543;
        mac->ops.led_off = e1000_led_off_82543;
        /* clear hardware counters */
        mac->ops.clear_hw_cntrs = e1000_clear_hw_cntrs_82543;

        /* Set tbi compatibility */
        if ((hw->mac.type != e1000_82543) ||
            (hw->phy.media_type == e1000_media_type_fiber))
                e1000_set_tbi_compatibility_82543(hw, false);

        return E1000_SUCCESS;
}

/**
 *  e1000_init_function_pointers_82543 - Init func ptrs.
 *  @hw: pointer to the HW structure
 *
 *  Called to initialize all function pointers and parameters.
 **/
void e1000_init_function_pointers_82543(struct e1000_hw *hw)
{
        DEBUGFUNC("e1000_init_function_pointers_82543");

        hw->mac.ops.init_params = e1000_init_mac_params_82543;
        hw->nvm.ops.init_params = e1000_init_nvm_params_82543;
        hw->phy.ops.init_params = e1000_init_phy_params_82543;
}

/**
 *  e1000_tbi_compatibility_enabled_82543 - Returns TBI compat status
 *  @hw: pointer to the HW structure
 *
 *  Returns the current status of 10-bit Interface (TBI) compatibility
 *  (enabled/disabled).
 **/
static bool e1000_tbi_compatibility_enabled_82543(struct e1000_hw *hw)
{
        struct e1000_dev_spec_82543 *dev_spec = &hw->dev_spec._82543;
        bool state = false;

        DEBUGFUNC("e1000_tbi_compatibility_enabled_82543");

        if (hw->mac.type != e1000_82543) {
                DEBUGOUT("TBI compatibility workaround for 82543 only.\n");
                goto out;
        }

        state = !!(dev_spec->tbi_compatibility & TBI_COMPAT_ENABLED);

out:
        return state;
}

/**
 *  e1000_set_tbi_compatibility_82543 - Set TBI compatibility
 *  @hw: pointer to the HW structure
 *  @state: enable/disable TBI compatibility
 *
 *  Enables or disabled 10-bit Interface (TBI) compatibility.
 **/
void e1000_set_tbi_compatibility_82543(struct e1000_hw *hw, bool state)
{
        struct e1000_dev_spec_82543 *dev_spec = &hw->dev_spec._82543;

        DEBUGFUNC("e1000_set_tbi_compatibility_82543");

        if (hw->mac.type != e1000_82543) {
                DEBUGOUT("TBI compatibility workaround for 82543 only.\n");
                goto out;
        }

        if (state)
                dev_spec->tbi_compatibility |= TBI_COMPAT_ENABLED;
        else
                dev_spec->tbi_compatibility &= ~TBI_COMPAT_ENABLED;

out:
        return;
}

/**
 *  e1000_tbi_sbp_enabled_82543 - Returns TBI SBP status
 *  @hw: pointer to the HW structure
 *
 *  Returns the current status of 10-bit Interface (TBI) store bad packet (SBP)
 *  (enabled/disabled).
 **/
bool e1000_tbi_sbp_enabled_82543(struct e1000_hw *hw)
{
        struct e1000_dev_spec_82543 *dev_spec = &hw->dev_spec._82543;
        bool state = false;

        DEBUGFUNC("e1000_tbi_sbp_enabled_82543");

        if (hw->mac.type != e1000_82543) {
                DEBUGOUT("TBI compatibility workaround for 82543 only.\n");
                goto out;
        }

        state = !!(dev_spec->tbi_compatibility & TBI_SBP_ENABLED);

out:
        return state;
}

/**
 *  e1000_set_tbi_sbp_82543 - Set TBI SBP
 *  @hw: pointer to the HW structure
 *  @state: enable/disable TBI store bad packet
 *
 *  Enables or disabled 10-bit Interface (TBI) store bad packet (SBP).
 **/
static void e1000_set_tbi_sbp_82543(struct e1000_hw *hw, bool state)
{
        struct e1000_dev_spec_82543 *dev_spec = &hw->dev_spec._82543;

        DEBUGFUNC("e1000_set_tbi_sbp_82543");

        if (state && e1000_tbi_compatibility_enabled_82543(hw))
                dev_spec->tbi_compatibility |= TBI_SBP_ENABLED;
        else
                dev_spec->tbi_compatibility &= ~TBI_SBP_ENABLED;

        return;
}

/**
 *  e1000_init_phy_disabled_82543 - Returns init PHY status
 *  @hw: pointer to the HW structure
 *
 *  Returns the current status of whether PHY initialization is disabled.
 *  True if PHY initialization is disabled else false.
 **/
static bool e1000_init_phy_disabled_82543(struct e1000_hw *hw)
{
        struct e1000_dev_spec_82543 *dev_spec = &hw->dev_spec._82543;
        bool ret_val;

        DEBUGFUNC("e1000_init_phy_disabled_82543");

        if (hw->mac.type != e1000_82543) {
                ret_val = false;
                goto out;
        }

        ret_val = dev_spec->init_phy_disabled;

out:
        return ret_val;
}

/**
 *  e1000_tbi_adjust_stats_82543 - Adjust stats when TBI enabled
 *  @hw: pointer to the HW structure
 *  @stats: Struct containing statistic register values
 *  @frame_len: The length of the frame in question
 *  @mac_addr: The Ethernet destination address of the frame in question
 *  @max_frame_size: The maximum frame size
 *
 *  Adjusts the statistic counters when a frame is accepted by TBI_ACCEPT
 **/
void e1000_tbi_adjust_stats_82543(struct e1000_hw *hw,
                                  struct e1000_hw_stats *stats, u32 frame_len,
                                  u8 *mac_addr, u32 max_frame_size)
{
        if (!(e1000_tbi_sbp_enabled_82543(hw)))
                goto out;

        /* First adjust the frame length. */
        frame_len--;
        /*
         * We need to adjust the statistics counters, since the hardware
         * counters overcount this packet as a CRC error and undercount
         * the packet as a good packet
         */
        /* This packet should not be counted as a CRC error. */
        stats->crcerrs--;
        /* This packet does count as a Good Packet Received. */
        stats->gprc++;

        /* Adjust the Good Octets received counters */
        stats->gorc += frame_len;

        /*
         * Is this a broadcast or multicast?  Check broadcast first,
         * since the test for a multicast frame will test positive on
         * a broadcast frame.
         */
        if ((mac_addr[0] == 0xff) && (mac_addr[1] == 0xff))
                /* Broadcast packet */
                stats->bprc++;
        else if (*mac_addr & 0x01)
                /* Multicast packet */
                stats->mprc++;

        /*
         * In this case, the hardware has over counted the number of
         * oversize frames.
         */
        if ((frame_len == max_frame_size) && (stats->roc > 0))
                stats->roc--;

        /*
         * Adjust the bin counters when the extra byte put the frame in the
         * wrong bin. Remember that the frame_len was adjusted above.
         */
        if (frame_len == 64) {
                stats->prc64++;
                stats->prc127--;
        } else if (frame_len == 127) {
                stats->prc127++;
                stats->prc255--;
        } else if (frame_len == 255) {
                stats->prc255++;
                stats->prc511--;
        } else if (frame_len == 511) {
                stats->prc511++;
                stats->prc1023--;
        } else if (frame_len == 1023) {
                stats->prc1023++;
                stats->prc1522--;
        } else if (frame_len == 1522) {
                stats->prc1522++;
        }

out:
        return;
}

/**
 *  e1000_read_phy_reg_82543 - Read PHY register
 *  @hw: pointer to the HW structure
 *  @offset: register offset to be read
 *  @data: pointer to the read data
 *
 *  Reads the PHY at offset and stores the information read to data.
 **/
static s32 e1000_read_phy_reg_82543(struct e1000_hw *hw, u32 offset, u16 *data)
{
        u32 mdic;
        s32 ret_val = E1000_SUCCESS;

        DEBUGFUNC("e1000_read_phy_reg_82543");

        if (offset > MAX_PHY_REG_ADDRESS) {
                DEBUGOUT1("PHY Address %d is out of range\n", offset);
                ret_val = -E1000_ERR_PARAM;
                goto out;
        }

        /*
         * We must first send a preamble through the MDIO pin to signal the
         * beginning of an MII instruction.  This is done by sending 32
         * consecutive "1" bits.
         */
        e1000_shift_out_mdi_bits_82543(hw, PHY_PREAMBLE, PHY_PREAMBLE_SIZE);

        /*
         * Now combine the next few fields that are required for a read
         * operation.  We use this method instead of calling the
         * e1000_shift_out_mdi_bits routine five different times.  The format
         * of an MII read instruction consists of a shift out of 14 bits and
         * is defined as follows:
         *         <Preamble><SOF><Op Code><Phy Addr><Offset>
         * followed by a shift in of 18 bits.  This first two bits shifted in
         * are TurnAround bits used to avoid contention on the MDIO pin when a
         * READ operation is performed.  These two bits are thrown away
         * followed by a shift in of 16 bits which contains the desired data.
         */
        mdic = (offset | (hw->phy.addr << 5) |
                (PHY_OP_READ << 10) | (PHY_SOF << 12));

        e1000_shift_out_mdi_bits_82543(hw, mdic, 14);

        /*
         * Now that we've shifted out the read command to the MII, we need to
         * "shift in" the 16-bit value (18 total bits) of the requested PHY
         * register address.
         */
        *data = e1000_shift_in_mdi_bits_82543(hw);

out:
        return ret_val;
}

/**
 *  e1000_write_phy_reg_82543 - Write PHY register
 *  @hw: pointer to the HW structure
 *  @offset: register offset to be written
 *  @data: pointer to the data to be written at offset
 *
 *  Writes data to the PHY at offset.
 **/
static s32 e1000_write_phy_reg_82543(struct e1000_hw *hw, u32 offset, u16 data)
{
        u32 mdic;
        s32 ret_val = E1000_SUCCESS;

        DEBUGFUNC("e1000_write_phy_reg_82543");

        if (offset > MAX_PHY_REG_ADDRESS) {
                DEBUGOUT1("PHY Address %d is out of range\n", offset);
                ret_val = -E1000_ERR_PARAM;
                goto out;
        }

        /*
         * We'll need to use the SW defined pins to shift the write command
         * out to the PHY. We first send a preamble to the PHY to signal the
         * beginning of the MII instruction.  This is done by sending 32
         * consecutive "1" bits.
         */
        e1000_shift_out_mdi_bits_82543(hw, PHY_PREAMBLE, PHY_PREAMBLE_SIZE);

        /*
         * Now combine the remaining required fields that will indicate a
         * write operation. We use this method instead of calling the
         * e1000_shift_out_mdi_bits routine for each field in the command. The
         * format of a MII write instruction is as follows:
         * <Preamble><SOF><Op Code><Phy Addr><Reg Addr><Turnaround><Data>.
         */
        mdic = ((PHY_TURNAROUND) | (offset << 2) | (hw->phy.addr << 7) |
                (PHY_OP_WRITE << 12) | (PHY_SOF << 14));
        mdic <<= 16;
        mdic |= (u32)data;

        e1000_shift_out_mdi_bits_82543(hw, mdic, 32);

out:
        return ret_val;
}

/**
 *  e1000_raise_mdi_clk_82543 - Raise Management Data Input clock
 *  @hw: pointer to the HW structure
 *  @ctrl: pointer to the control register
 *
 *  Raise the management data input clock by setting the MDC bit in the control
 *  register.
 **/
static void e1000_raise_mdi_clk_82543(struct e1000_hw *hw, u32 *ctrl)
{
        /*
         * Raise the clock input to the Management Data Clock (by setting the
         * MDC bit), and then delay a sufficient amount of time.
         */
        E1000_WRITE_REG(hw, E1000_CTRL, (*ctrl | E1000_CTRL_MDC));
        E1000_WRITE_FLUSH(hw);
        usec_delay(10);
}

/**
 *  e1000_lower_mdi_clk_82543 - Lower Management Data Input clock
 *  @hw: pointer to the HW structure
 *  @ctrl: pointer to the control register
 *
 *  Lower the management data input clock by clearing the MDC bit in the
 *  control register.
 **/
static void e1000_lower_mdi_clk_82543(struct e1000_hw *hw, u32 *ctrl)
{
        /*
         * Lower the clock input to the Management Data Clock (by clearing the
         * MDC bit), and then delay a sufficient amount of time.
         */
        E1000_WRITE_REG(hw, E1000_CTRL, (*ctrl & ~E1000_CTRL_MDC));
        E1000_WRITE_FLUSH(hw);
        usec_delay(10);
}

/**
 *  e1000_shift_out_mdi_bits_82543 - Shift data bits our to the PHY
 *  @hw: pointer to the HW structure
 *  @data: data to send to the PHY
 *  @count: number of bits to shift out
 *
 *  We need to shift 'count' bits out to the PHY.  So, the value in the
 *  "data" parameter will be shifted out to the PHY one bit at a time.
 *  In order to do this, "data" must be broken down into bits.
 **/
static void e1000_shift_out_mdi_bits_82543(struct e1000_hw *hw, u32 data,
                                           u16 count)
{
        u32 ctrl, mask;

        /*
         * We need to shift "count" number of bits out to the PHY.  So, the
         * value in the "data" parameter will be shifted out to the PHY one
         * bit at a time.  In order to do this, "data" must be broken down
         * into bits.
         */
        mask = 0x01;
        mask <<= (count - 1);

        ctrl = E1000_READ_REG(hw, E1000_CTRL);

        /* Set MDIO_DIR and MDC_DIR direction bits to be used as output pins. */
        ctrl |= (E1000_CTRL_MDIO_DIR | E1000_CTRL_MDC_DIR);

        while (mask) {
                /*
                 * A "1" is shifted out to the PHY by setting the MDIO bit to
                 * "1" and then raising and lowering the Management Data Clock.
                 * A "0" is shifted out to the PHY by setting the MDIO bit to
                 * "0" and then raising and lowering the clock.
                 */
                if (data & mask)
                        ctrl |= E1000_CTRL_MDIO;
                else
                        ctrl &= ~E1000_CTRL_MDIO;

                E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
                E1000_WRITE_FLUSH(hw);

                usec_delay(10);

                e1000_raise_mdi_clk_82543(hw, &ctrl);
                e1000_lower_mdi_clk_82543(hw, &ctrl);

                mask >>= 1;
        }
}

/**
 *  e1000_shift_in_mdi_bits_82543 - Shift data bits in from the PHY
 *  @hw: pointer to the HW structure
 *
 *  In order to read a register from the PHY, we need to shift 18 bits
 *  in from the PHY.  Bits are "shifted in" by raising the clock input to
 *  the PHY (setting the MDC bit), and then reading the value of the data out
 *  MDIO bit.
 **/
static u16 e1000_shift_in_mdi_bits_82543(struct e1000_hw *hw)
{
        u32 ctrl;
        u16 data = 0;
        u8 i;

        /*
         * In order to read a register from the PHY, we need to shift in a
         * total of 18 bits from the PHY.  The first two bit (turnaround)
         * times are used to avoid contention on the MDIO pin when a read
         * operation is performed.  These two bits are ignored by us and
         * thrown away.  Bits are "shifted in" by raising the input to the
         * Management Data Clock (setting the MDC bit) and then reading the
         * value of the MDIO bit.
         */
        ctrl = E1000_READ_REG(hw, E1000_CTRL);

        /*
         * Clear MDIO_DIR (SWDPIO1) to indicate this bit is to be used as
         * input.
         */
        ctrl &= ~E1000_CTRL_MDIO_DIR;
        ctrl &= ~E1000_CTRL_MDIO;

        E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
        E1000_WRITE_FLUSH(hw);

        /*
         * Raise and lower the clock before reading in the data.  This accounts
         * for the turnaround bits.  The first clock occurred when we clocked
         * out the last bit of the Register Address.
         */
        e1000_raise_mdi_clk_82543(hw, &ctrl);
        e1000_lower_mdi_clk_82543(hw, &ctrl);

        for (data = 0, i = 0; i < 16; i++) {
                data <<= 1;
                e1000_raise_mdi_clk_82543(hw, &ctrl);
                ctrl = E1000_READ_REG(hw, E1000_CTRL);
                /* Check to see if we shifted in a "1". */
                if (ctrl & E1000_CTRL_MDIO)
                        data |= 1;
                e1000_lower_mdi_clk_82543(hw, &ctrl);
        }

        e1000_raise_mdi_clk_82543(hw, &ctrl);
        e1000_lower_mdi_clk_82543(hw, &ctrl);

        return data;
}

/**
 *  e1000_phy_force_speed_duplex_82543 - Force speed/duplex for PHY
 *  @hw: pointer to the HW structure
 *
 *  Calls the function to force speed and duplex for the m88 PHY, and
 *  if the PHY is not auto-negotiating and the speed is forced to 10Mbit,
 *  then call the function for polarity reversal workaround.
 **/
static s32 e1000_phy_force_speed_duplex_82543(struct e1000_hw *hw)
{
        s32 ret_val;

        DEBUGFUNC("e1000_phy_force_speed_duplex_82543");

        ret_val = e1000_phy_force_speed_duplex_m88(hw);
        if (ret_val)
                goto out;

        if (!hw->mac.autoneg && (hw->mac.forced_speed_duplex &
            E1000_ALL_10_SPEED))
                ret_val = e1000_polarity_reversal_workaround_82543(hw);

out:
        return ret_val;
}

/**
 *  e1000_polarity_reversal_workaround_82543 - Workaround polarity reversal
 *  @hw: pointer to the HW structure
 *
 *  When forcing link to 10 Full or 10 Half, the PHY can reverse the polarity
 *  inadvertently.  To workaround the issue, we disable the transmitter on
 *  the PHY until we have established the link partner's link parameters.
 **/
static s32 e1000_polarity_reversal_workaround_82543(struct e1000_hw *hw)
{
        s32 ret_val = E1000_SUCCESS;
        u16 mii_status_reg;
        u16 i;
        bool link;

        if (!(hw->phy.ops.write_reg))
                goto out;

        /* Polarity reversal workaround for forced 10F/10H links. */

        /* Disable the transmitter on the PHY */

        ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_PAGE_SELECT, 0x0019);
        if (ret_val)
                goto out;
        ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_GEN_CONTROL, 0xFFFF);
        if (ret_val)
                goto out;

        ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_PAGE_SELECT, 0x0000);
        if (ret_val)
                goto out;

        /*
         * This loop will early-out if the NO link condition has been met.
         * In other words, DO NOT use e1000_phy_has_link_generic() here.
         */
        for (i = PHY_FORCE_TIME; i > 0; i--) {
                /*
                 * Read the MII Status Register and wait for Link Status bit
                 * to be clear.
                 */

                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_LINK_STATUS))
                        break;
                msec_delay_irq(100);
        }

        /* Recommended delay time after link has been lost */
        msec_delay_irq(1000);

        /* Now we will re-enable the transmitter on the PHY */

        ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_PAGE_SELECT, 0x0019);
        if (ret_val)
                goto out;
        msec_delay_irq(50);
        ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_GEN_CONTROL, 0xFFF0);
        if (ret_val)
                goto out;
        msec_delay_irq(50);
        ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_GEN_CONTROL, 0xFF00);
        if (ret_val)
                goto out;
        msec_delay_irq(50);
        ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_GEN_CONTROL, 0x0000);
        if (ret_val)
                goto out;

        ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_PAGE_SELECT, 0x0000);
        if (ret_val)
                goto out;

        /*
         * Read the MII Status Register and wait for Link Status bit
         * to be set.
         */
        ret_val = e1000_phy_has_link_generic(hw, PHY_FORCE_TIME, 100000, &link);
        if (ret_val)
                goto out;

out:
        return ret_val;
}

/**
 *  e1000_phy_hw_reset_82543 - PHY hardware reset
 *  @hw: pointer to the HW structure
 *
 *  Sets the PHY_RESET_DIR bit in the extended device control register
 *  to put the PHY into a reset and waits for completion.  Once the reset
 *  has been accomplished, clear the PHY_RESET_DIR bit to take the PHY out
 *  of reset.
 **/
static s32 e1000_phy_hw_reset_82543(struct e1000_hw *hw)
{
        u32 ctrl_ext;
        s32 ret_val;

        DEBUGFUNC("e1000_phy_hw_reset_82543");

        /*
         * Read the Extended Device Control Register, assert the PHY_RESET_DIR
         * bit to put the PHY into reset...
         */
        ctrl_ext = E1000_READ_REG(hw, E1000_CTRL_EXT);
        ctrl_ext |= E1000_CTRL_EXT_SDP4_DIR;
        ctrl_ext &= ~E1000_CTRL_EXT_SDP4_DATA;
        E1000_WRITE_REG(hw, E1000_CTRL_EXT, ctrl_ext);
        E1000_WRITE_FLUSH(hw);

        msec_delay(10);

        /* ...then take it out of reset. */
        ctrl_ext |= E1000_CTRL_EXT_SDP4_DATA;
        E1000_WRITE_REG(hw, E1000_CTRL_EXT, ctrl_ext);
        E1000_WRITE_FLUSH(hw);

        usec_delay(150);

        if (!(hw->phy.ops.get_cfg_done))
                return E1000_SUCCESS;

        ret_val = hw->phy.ops.get_cfg_done(hw);

        return ret_val;
}

/**
 *  e1000_reset_hw_82543 - Reset hardware
 *  @hw: pointer to the HW structure
 *
 *  This resets the hardware into a known state.
 **/
static s32 e1000_reset_hw_82543(struct e1000_hw *hw)
{
        u32 ctrl;
        s32 ret_val = E1000_SUCCESS;

        DEBUGFUNC("e1000_reset_hw_82543");

        DEBUGOUT("Masking off all interrupts\n");
        E1000_WRITE_REG(hw, E1000_IMC, 0xffffffff);

        E1000_WRITE_REG(hw, E1000_RCTL, 0);
        E1000_WRITE_REG(hw, E1000_TCTL, E1000_TCTL_PSP);
        E1000_WRITE_FLUSH(hw);

        e1000_set_tbi_sbp_82543(hw, false);

        /*
         * Delay to allow any outstanding PCI transactions to complete before
         * resetting the device
         */
        msec_delay(10);

        ctrl = E1000_READ_REG(hw, E1000_CTRL);

        DEBUGOUT("Issuing a global reset to 82543/82544 MAC\n");
        if (hw->mac.type == e1000_82543) {
                E1000_WRITE_REG(hw, E1000_CTRL, ctrl | E1000_CTRL_RST);
        } else {
                /*
                 * The 82544 can't ACK the 64-bit write when issuing the
                 * reset, so use IO-mapping as a workaround.
                 */
                E1000_WRITE_REG_IO(hw, E1000_CTRL, ctrl | E1000_CTRL_RST);
        }

        /*
         * After MAC reset, force reload of NVM to restore power-on
         * settings to device.
         */
        hw->nvm.ops.reload(hw);
        msec_delay(2);

        /* Masking off and clearing any pending interrupts */
        E1000_WRITE_REG(hw, E1000_IMC, 0xffffffff);
        E1000_READ_REG(hw, E1000_ICR);

        return ret_val;
}

/**
 *  e1000_init_hw_82543 - Initialize hardware
 *  @hw: pointer to the HW structure
 *
 *  This inits the hardware readying it for operation.
 **/
static s32 e1000_init_hw_82543(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        struct e1000_dev_spec_82543 *dev_spec = &hw->dev_spec._82543;
        u32 ctrl;
        s32 ret_val;
        u16 i;

        DEBUGFUNC("e1000_init_hw_82543");

        /* Disabling VLAN filtering */
        E1000_WRITE_REG(hw, E1000_VET, 0);
        mac->ops.clear_vfta(hw);

        /* Setup the receive address. */
        e1000_init_rx_addrs_generic(hw, mac->rar_entry_count);

        /* Zero out the Multicast HASH table */
        DEBUGOUT("Zeroing the MTA\n");
        for (i = 0; i < mac->mta_reg_count; i++) {
                E1000_WRITE_REG_ARRAY(hw, E1000_MTA, i, 0);
                E1000_WRITE_FLUSH(hw);
        }

        /*
         * Set the PCI priority bit correctly in the CTRL register.  This
         * determines if the adapter gives priority to receives, or if it
         * gives equal priority to transmits and receives.
         */
        if (hw->mac.type == e1000_82543 && dev_spec->dma_fairness) {
                ctrl = E1000_READ_REG(hw, E1000_CTRL);
                E1000_WRITE_REG(hw, E1000_CTRL, ctrl | E1000_CTRL_PRIOR);
        }

        e1000_pcix_mmrbc_workaround_generic(hw);

        /* Setup link and flow control */
        ret_val = mac->ops.setup_link(hw);

        /*
         * Clear all of the statistics registers (clear on read).  It is
         * important that we do this after we have tried to establish link
         * because the symbol error count will increment wildly if there
         * is no link.
         */
        e1000_clear_hw_cntrs_82543(hw);

        return ret_val;
}

/**
 *  e1000_setup_link_82543 - Setup flow control and link settings
 *  @hw: pointer to the HW structure
 *
 *  Read the EEPROM to determine the initial polarity value and write the
 *  extended device control register with the information before calling
 *  the generic setup link function, which does the following:
 *  Determines which flow control settings to use, then configures flow
 *  control.  Calls the appropriate media-specific link configuration
 *  function.  Assuming the adapter has a valid link partner, a valid link
 *  should be established.  Assumes the hardware has previously been reset
 *  and the transmitter and receiver are not enabled.
 **/
static s32 e1000_setup_link_82543(struct e1000_hw *hw)
{
        u32 ctrl_ext;
        s32  ret_val;
        u16 data;

        DEBUGFUNC("e1000_setup_link_82543");

        /*
         * Take the 4 bits from NVM word 0xF that determine the initial
         * polarity value for the SW controlled pins, and setup the
         * Extended Device Control reg with that info.
         * This is needed because one of the SW controlled pins is used for
         * signal detection.  So this should be done before phy setup.
         */
        if (hw->mac.type == e1000_82543) {
                ret_val = hw->nvm.ops.read(hw, NVM_INIT_CONTROL2_REG, 1, &data);
                if (ret_val) {
                        DEBUGOUT("NVM Read Error\n");
                        ret_val = -E1000_ERR_NVM;
                        goto out;
                }
                ctrl_ext = ((data & NVM_WORD0F_SWPDIO_EXT_MASK) <<
                            NVM_SWDPIO_EXT_SHIFT);
                E1000_WRITE_REG(hw, E1000_CTRL_EXT, ctrl_ext);
        }

        ret_val = e1000_setup_link_generic(hw);

out:
        return ret_val;
}

/**
 *  e1000_setup_copper_link_82543 - 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 e1000_setup_copper_link_82543(struct e1000_hw *hw)
{
        u32 ctrl;
        s32 ret_val;
        bool link = true;

        DEBUGFUNC("e1000_setup_copper_link_82543");

        ctrl = E1000_READ_REG(hw, E1000_CTRL) | E1000_CTRL_SLU;
        /*
         * With 82543, we need to force speed and duplex on the MAC
         * equal to what the PHY speed and duplex configuration is.
         * In addition, we need to perform a hardware reset on the
         * PHY to take it out of reset.
         */
        if (hw->mac.type == e1000_82543) {
                ctrl |= (E1000_CTRL_FRCSPD | E1000_CTRL_FRCDPX);
                E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
                ret_val = hw->phy.ops.reset(hw);
                if (ret_val)
                        goto out;
        } else {
                ctrl &= ~(E1000_CTRL_FRCSPD | E1000_CTRL_FRCDPX);
                E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
        }

        /* Set MDI/MDI-X, Polarity Reversal, and downshift settings */
        ret_val = e1000_copper_link_setup_m88(hw);
        if (ret_val)
                goto out;

        if (hw->mac.autoneg) {
                /*
                 * Setup autoneg and flow control advertisement and perform
                 * autonegotiation.
                 */
                ret_val = e1000_copper_link_autoneg(hw);
                if (ret_val)
                        goto out;
        } else {
                /*
                 * PHY will be set to 10H, 10F, 100H or 100F
                 * depending on user settings.
                 */
                DEBUGOUT("Forcing Speed and Duplex\n");
                ret_val = e1000_phy_force_speed_duplex_82543(hw);
                if (ret_val) {
                        DEBUGOUT("Error Forcing Speed and Duplex\n");
                        goto out;
                }
        }

        /*
         * Check link status. Wait up to 100 microseconds for link to become
         * valid.
         */
        ret_val = e1000_phy_has_link_generic(hw, COPPER_LINK_UP_LIMIT, 10,
                                             &link);
        if (ret_val)
                goto out;


        if (link) {
                DEBUGOUT("Valid link established!!!\n");
                /* Config the MAC and PHY after link is up */
                if (hw->mac.type == e1000_82544) {
                        hw->mac.ops.config_collision_dist(hw);
                } else {
                        ret_val = e1000_config_mac_to_phy_82543(hw);
                        if (ret_val)
                                goto out;
                }
                ret_val = e1000_config_fc_after_link_up_generic(hw);
        } else {
                DEBUGOUT("Unable to establish link!!!\n");
        }

out:
        return ret_val;
}

/**
 *  e1000_setup_fiber_link_82543 - Setup link for fiber
 *  @hw: pointer to the HW structure
 *
 *  Configures collision distance and flow control for fiber links.  Upon
 *  successful setup, poll for link.
 **/
static s32 e1000_setup_fiber_link_82543(struct e1000_hw *hw)
{
        u32 ctrl;
        s32 ret_val;

        DEBUGFUNC("e1000_setup_fiber_link_82543");

        ctrl = E1000_READ_REG(hw, E1000_CTRL);

        /* Take the link out of reset */
        ctrl &= ~E1000_CTRL_LRST;

        hw->mac.ops.config_collision_dist(hw);

        ret_val = e1000_commit_fc_settings_generic(hw);
        if (ret_val)
                goto out;

        DEBUGOUT("Auto-negotiation enabled\n");

        E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
        E1000_WRITE_FLUSH(hw);
        msec_delay(1);

        /*
         * For these adapters, the SW definable pin 1 is cleared when the
         * optics detect a signal.  If we have a signal, then poll for a
         * "Link-Up" indication.
         */
        if (!(E1000_READ_REG(hw, E1000_CTRL) & E1000_CTRL_SWDPIN1))
                ret_val = e1000_poll_fiber_serdes_link_generic(hw);
        else
                DEBUGOUT("No signal detected\n");

out:
        return ret_val;
}

/**
 *  e1000_check_for_copper_link_82543 - Check for link (Copper)
 *  @hw: pointer to the HW structure
 *
 *  Checks the phy for link, if link exists, do the following:
 *   - check for downshift
 *   - do polarity workaround (if necessary)
 *   - configure collision distance
 *   - configure flow control after link up
 *   - configure tbi compatibility
 **/
static s32 e1000_check_for_copper_link_82543(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        u32 icr, rctl;
        s32 ret_val;
        u16 speed, duplex;
        bool link;

        DEBUGFUNC("e1000_check_for_copper_link_82543");

        if (!mac->get_link_status) {
                ret_val = E1000_SUCCESS;
                goto out;
        }

        ret_val = e1000_phy_has_link_generic(hw, 1, 0, &link);
        if (ret_val)
                goto out;

        if (!link)
                goto out; /* No link detected */

        mac->get_link_status = false;

        e1000_check_downshift_generic(hw);

        /*
         * If we are forcing speed/duplex, then we can return since
         * we have already determined whether we have link or not.
         */
        if (!mac->autoneg) {
                /*
                 * If speed and duplex are forced to 10H or 10F, then we will
                 * implement the polarity reversal workaround.  We disable
                 * interrupts first, and upon returning, place the devices
                 * interrupt state to its previous value except for the link
                 * status change interrupt which will happened due to the
                 * execution of this workaround.
                 */
                if (mac->forced_speed_duplex & E1000_ALL_10_SPEED) {
                        E1000_WRITE_REG(hw, E1000_IMC, 0xFFFFFFFF);
                        ret_val = e1000_polarity_reversal_workaround_82543(hw);
                        icr = E1000_READ_REG(hw, E1000_ICR);
                        E1000_WRITE_REG(hw, E1000_ICS, (icr & ~E1000_ICS_LSC));
                        E1000_WRITE_REG(hw, E1000_IMS, IMS_ENABLE_MASK);
                }

                ret_val = -E1000_ERR_CONFIG;
                goto out;
        }

        /*
         * We have a M88E1000 PHY and Auto-Neg is enabled.  If we
         * have Si on board that is 82544 or newer, Auto
         * Speed Detection takes care of MAC speed/duplex
         * configuration.  So we only need to configure Collision
         * Distance in the MAC.  Otherwise, we need to force
         * speed/duplex on the MAC to the current PHY speed/duplex
         * settings.
         */
        if (mac->type == e1000_82544)
                hw->mac.ops.config_collision_dist(hw);
        else {
                ret_val = e1000_config_mac_to_phy_82543(hw);
                if (ret_val) {
                        DEBUGOUT("Error configuring MAC to PHY settings\n");
                        goto out;
                }
        }

        /*
         * Configure Flow Control now that Auto-Neg has completed.
         * First, we need to restore the desired flow control
         * settings because we may have had to re-autoneg with a
         * different link partner.
         */
        ret_val = e1000_config_fc_after_link_up_generic(hw);
        if (ret_val)
                DEBUGOUT("Error configuring flow control\n");

        /*
         * At this point we know that we are on copper and we have
         * auto-negotiated link.  These are conditions for checking the link
         * partner capability register.  We use the link speed to determine if
         * TBI compatibility needs to be turned on or off.  If the link is not
         * at gigabit speed, then TBI compatibility is not needed.  If we are
         * at gigabit speed, we turn on TBI compatibility.
         */
        if (e1000_tbi_compatibility_enabled_82543(hw)) {
                ret_val = mac->ops.get_link_up_info(hw, &speed, &duplex);
                if (ret_val) {
                        DEBUGOUT("Error getting link speed and duplex\n");
                        return ret_val;
                }
                if (speed != SPEED_1000) {
                        /*
                         * If link speed is not set to gigabit speed,
                         * we do not need to enable TBI compatibility.
                         */
                        if (e1000_tbi_sbp_enabled_82543(hw)) {
                                /*
                                 * If we previously were in the mode,
                                 * turn it off.
                                 */
                                e1000_set_tbi_sbp_82543(hw, false);
                                rctl = E1000_READ_REG(hw, E1000_RCTL);
                                rctl &= ~E1000_RCTL_SBP;
                                E1000_WRITE_REG(hw, E1000_RCTL, rctl);
                        }
                } else {
                        /*
                         * If TBI compatibility is was previously off,
                         * turn it on. For compatibility with a TBI link
                         * partner, we will store bad packets. Some
                         * frames have an additional byte on the end and
                         * will look like CRC errors to the hardware.
                         */
                        if (!e1000_tbi_sbp_enabled_82543(hw)) {
                                e1000_set_tbi_sbp_82543(hw, true);
                                rctl = E1000_READ_REG(hw, E1000_RCTL);
                                rctl |= E1000_RCTL_SBP;
                                E1000_WRITE_REG(hw, E1000_RCTL, rctl);
                        }
                }
        }
out:
        return ret_val;
}

/**
 *  e1000_check_for_fiber_link_82543 - Check for link (Fiber)
 *  @hw: pointer to the HW structure
 *
 *  Checks for link up on the hardware.  If link is not up and we have
 *  a signal, then we need to force link up.
 **/
static s32 e1000_check_for_fiber_link_82543(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        u32 rxcw, ctrl, status;
        s32 ret_val = E1000_SUCCESS;

        DEBUGFUNC("e1000_check_for_fiber_link_82543");

        ctrl = E1000_READ_REG(hw, E1000_CTRL);
        status = E1000_READ_REG(hw, E1000_STATUS);
        rxcw = E1000_READ_REG(hw, E1000_RXCW);

        /*
         * If we don't have link (auto-negotiation failed or link partner
         * cannot auto-negotiate), the cable is plugged in (we have signal),
         * and our link partner is not trying to auto-negotiate with us (we
         * are receiving idles or data), we need to force link up. We also
         * need to give auto-negotiation time to complete, in case the cable
         * was just plugged in. The autoneg_failed flag does this.
         */
        /* (ctrl & E1000_CTRL_SWDPIN1) == 0 == have signal */
        if ((!(ctrl & E1000_CTRL_SWDPIN1)) &&
            (!(status & E1000_STATUS_LU)) &&
            (!(rxcw & E1000_RXCW_C))) {
                if (!mac->autoneg_failed) {
                        mac->autoneg_failed = true;
                        ret_val = 0;
                        goto out;
                }
                DEBUGOUT("NOT RXing /C/, disable AutoNeg and force link.\n");

                /* Disable auto-negotiation in the TXCW register */
                E1000_WRITE_REG(hw, E1000_TXCW, (mac->txcw & ~E1000_TXCW_ANE));

                /* Force link-up and also force full-duplex. */
                ctrl = E1000_READ_REG(hw, E1000_CTRL);
                ctrl |= (E1000_CTRL_SLU | E1000_CTRL_FD);
                E1000_WRITE_REG(hw, E1000_CTRL, ctrl);

                /* Configure Flow Control after forcing link up. */
                ret_val = e1000_config_fc_after_link_up_generic(hw);
                if (ret_val) {
                        DEBUGOUT("Error configuring flow control\n");
                        goto out;
                }
        } else if ((ctrl & E1000_CTRL_SLU) && (rxcw & E1000_RXCW_C)) {
                /*
                 * If we are forcing link and we are receiving /C/ ordered
                 * sets, re-enable auto-negotiation in the TXCW register
                 * and disable forced link in the Device Control register
                 * in an attempt to auto-negotiate with our link partner.
                 */
                DEBUGOUT("RXing /C/, enable AutoNeg and stop forcing link.\n");
                E1000_WRITE_REG(hw, E1000_TXCW, mac->txcw);
                E1000_WRITE_REG(hw, E1000_CTRL, (ctrl & ~E1000_CTRL_SLU));

                mac->serdes_has_link = true;
        }

out:
        return ret_val;
}

/**
 *  e1000_config_mac_to_phy_82543 - Configure MAC to PHY settings
 *  @hw: pointer to the HW structure
 *
 *  For the 82543 silicon, we need to set the MAC to match the settings
 *  of the PHY, even if the PHY is auto-negotiating.
 **/
static s32 e1000_config_mac_to_phy_82543(struct e1000_hw *hw)
{
        u32 ctrl;
        s32 ret_val = E1000_SUCCESS;
        u16 phy_data;

        DEBUGFUNC("e1000_config_mac_to_phy_82543");

        if (!(hw->phy.ops.read_reg))
                goto out;

        /* Set the bits to force speed and duplex */
        ctrl = E1000_READ_REG(hw, E1000_CTRL);
        ctrl |= (E1000_CTRL_FRCSPD | E1000_CTRL_FRCDPX);
        ctrl &= ~(E1000_CTRL_SPD_SEL | E1000_CTRL_ILOS);

        /*
         * Set up duplex in the Device Control and Transmit Control
         * registers depending on negotiated values.
         */
        ret_val = hw->phy.ops.read_reg(hw, M88E1000_PHY_SPEC_STATUS, &phy_data);
        if (ret_val)
                goto out;

        ctrl &= ~E1000_CTRL_FD;
        if (phy_data & M88E1000_PSSR_DPLX)
                ctrl |= E1000_CTRL_FD;

        hw->mac.ops.config_collision_dist(hw);

        /*
         * Set up speed in the Device Control register depending on
         * negotiated values.
         */
        if ((phy_data & M88E1000_PSSR_SPEED) == M88E1000_PSSR_1000MBS)
                ctrl |= E1000_CTRL_SPD_1000;
        else if ((phy_data & M88E1000_PSSR_SPEED) == M88E1000_PSSR_100MBS)
                ctrl |= E1000_CTRL_SPD_100;

        E1000_WRITE_REG(hw, E1000_CTRL, ctrl);

out:
        return ret_val;
}

/**
 *  e1000_write_vfta_82543 - Write value to VLAN filter table
 *  @hw: pointer to the HW structure
 *  @offset: the 32-bit offset in which to write the value to.
 *  @value: the 32-bit value to write at location offset.
 *
 *  This writes a 32-bit value to a 32-bit offset in the VLAN filter
 *  table.
 **/
static void e1000_write_vfta_82543(struct e1000_hw *hw, u32 offset, u32 value)
{
        u32 temp;

        DEBUGFUNC("e1000_write_vfta_82543");

        if ((hw->mac.type == e1000_82544) && (offset & 1)) {
                temp = E1000_READ_REG_ARRAY(hw, E1000_VFTA, offset - 1);
                E1000_WRITE_REG_ARRAY(hw, E1000_VFTA, offset, value);
                E1000_WRITE_FLUSH(hw);
                E1000_WRITE_REG_ARRAY(hw, E1000_VFTA, offset - 1, temp);
                E1000_WRITE_FLUSH(hw);
        } else {
                e1000_write_vfta_generic(hw, offset, value);
        }
}

/**
 *  e1000_led_on_82543 - Turn on SW controllable LED
 *  @hw: pointer to the HW structure
 *
 *  Turns the SW defined LED on.
 **/
static s32 e1000_led_on_82543(struct e1000_hw *hw)
{
        u32 ctrl = E1000_READ_REG(hw, E1000_CTRL);

        DEBUGFUNC("e1000_led_on_82543");

        if (hw->mac.type == e1000_82544 &&
            hw->phy.media_type == e1000_media_type_copper) {
                /* Clear SW-definable Pin 0 to turn on the LED */
                ctrl &= ~E1000_CTRL_SWDPIN0;
                ctrl |= E1000_CTRL_SWDPIO0;
        } else {
                /* Fiber 82544 and all 82543 use this method */
                ctrl |= E1000_CTRL_SWDPIN0;
                ctrl |= E1000_CTRL_SWDPIO0;
        }
        E1000_WRITE_REG(hw, E1000_CTRL, ctrl);

        return E1000_SUCCESS;
}

/**
 *  e1000_led_off_82543 - Turn off SW controllable LED
 *  @hw: pointer to the HW structure
 *
 *  Turns the SW defined LED off.
 **/
static s32 e1000_led_off_82543(struct e1000_hw *hw)
{
        u32 ctrl = E1000_READ_REG(hw, E1000_CTRL);

        DEBUGFUNC("e1000_led_off_82543");

        if (hw->mac.type == e1000_82544 &&
            hw->phy.media_type == e1000_media_type_copper) {
                /* Set SW-definable Pin 0 to turn off the LED */
                ctrl |= E1000_CTRL_SWDPIN0;
                ctrl |= E1000_CTRL_SWDPIO0;
        } else {
                ctrl &= ~E1000_CTRL_SWDPIN0;
                ctrl |= E1000_CTRL_SWDPIO0;
        }
        E1000_WRITE_REG(hw, E1000_CTRL, ctrl);

        return E1000_SUCCESS;
}

/**
 *  e1000_clear_hw_cntrs_82543 - Clear device specific hardware counters
 *  @hw: pointer to the HW structure
 *
 *  Clears the hardware counters by reading the counter registers.
 **/
static void e1000_clear_hw_cntrs_82543(struct e1000_hw *hw)
{
        DEBUGFUNC("e1000_clear_hw_cntrs_82543");

        e1000_clear_hw_cntrs_base_generic(hw);

        E1000_READ_REG(hw, E1000_PRC64);
        E1000_READ_REG(hw, E1000_PRC127);
        E1000_READ_REG(hw, E1000_PRC255);
        E1000_READ_REG(hw, E1000_PRC511);
        E1000_READ_REG(hw, E1000_PRC1023);
        E1000_READ_REG(hw, E1000_PRC1522);
        E1000_READ_REG(hw, E1000_PTC64);
        E1000_READ_REG(hw, E1000_PTC127);
        E1000_READ_REG(hw, E1000_PTC255);
        E1000_READ_REG(hw, E1000_PTC511);
        E1000_READ_REG(hw, E1000_PTC1023);
        E1000_READ_REG(hw, E1000_PTC1522);

        E1000_READ_REG(hw, E1000_ALGNERRC);
        E1000_READ_REG(hw, E1000_RXERRC);
        E1000_READ_REG(hw, E1000_TNCRS);
        E1000_READ_REG(hw, E1000_CEXTERR);
        E1000_READ_REG(hw, E1000_TSCTC);
        E1000_READ_REG(hw, E1000_TSCTFC);
}

/**
 *  e1000_read_mac_addr_82543 - Read device MAC address
 *  @hw: pointer to the HW structure
 *
 *  Reads the device MAC address from the EEPROM and stores the value.
 *  Since devices with two ports use the same EEPROM, we increment the
 *  last bit in the MAC address for the second port.
 *
 **/
s32 e1000_read_mac_addr_82543(struct e1000_hw *hw)
{
        s32  ret_val = E1000_SUCCESS;
        u16 offset, nvm_data, i;

        DEBUGFUNC("e1000_read_mac_addr");

        for (i = 0; i < ETHER_ADDR_LEN; i += 2) {
                offset = i >> 1;
                ret_val = hw->nvm.ops.read(hw, offset, 1, &nvm_data);
                if (ret_val) {
                        DEBUGOUT("NVM Read Error\n");
                        goto out;
                }
                hw->mac.perm_addr[i] = (u8)(nvm_data & 0xFF);
                hw->mac.perm_addr[i+1] = (u8)(nvm_data >> 8);
        }

        /* Flip last bit of mac address if we're on second port */
        if (hw->bus.func == E1000_FUNC_1)
                hw->mac.perm_addr[5] ^= 1;

        for (i = 0; i < ETHER_ADDR_LEN; i++)
                hw->mac.addr[i] = hw->mac.perm_addr[i];

out:
        return ret_val;
}