// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 1999 - 2018 Intel Corporation. */

/* 82571EB Gigabit Ethernet Controller
 * 82571EB Gigabit Ethernet Controller (Copper)
 * 82571EB Gigabit Ethernet Controller (Fiber)
 * 82571EB Dual Port Gigabit Mezzanine Adapter
 * 82571EB Quad Port Gigabit Mezzanine Adapter
 * 82571PT Gigabit PT Quad Port Server ExpressModule
 * 82572EI Gigabit Ethernet Controller (Copper)
 * 82572EI Gigabit Ethernet Controller (Fiber)
 * 82572EI Gigabit Ethernet Controller
 * 82573V Gigabit Ethernet Controller (Copper)
 * 82573E Gigabit Ethernet Controller (Copper)
 * 82573L Gigabit Ethernet Controller
 * 82574L Gigabit Network Connection
 * 82583V Gigabit Network Connection
 */

#include "e1000.h"

static s32 e1000_get_phy_id_82571(struct e1000_hw *hw);
static s32 e1000_setup_copper_link_82571(struct e1000_hw *hw);
static s32 e1000_setup_fiber_serdes_link_82571(struct e1000_hw *hw);
static s32 e1000_check_for_serdes_link_82571(struct e1000_hw *hw);
static s32 e1000_write_nvm_eewr_82571(struct e1000_hw *hw, u16 offset,
                                      u16 words, u16 *data);
static s32 e1000_fix_nvm_checksum_82571(struct e1000_hw *hw);
static void e1000_initialize_hw_bits_82571(struct e1000_hw *hw);
static void e1000_clear_hw_cntrs_82571(struct e1000_hw *hw);
static bool e1000_check_mng_mode_82574(struct e1000_hw *hw);
static s32 e1000_led_on_82574(struct e1000_hw *hw);
static void e1000_put_hw_semaphore_82571(struct e1000_hw *hw);
static void e1000_power_down_phy_copper_82571(struct e1000_hw *hw);
static void e1000_put_hw_semaphore_82573(struct e1000_hw *hw);
static s32 e1000_get_hw_semaphore_82574(struct e1000_hw *hw);
static void e1000_put_hw_semaphore_82574(struct e1000_hw *hw);
static s32 e1000_set_d0_lplu_state_82574(struct e1000_hw *hw, bool active);
static s32 e1000_set_d3_lplu_state_82574(struct e1000_hw *hw, bool active);

/**
 *  e1000_init_phy_params_82571 - Init PHY func ptrs.
 *  @hw: pointer to the HW structure
 **/
static s32 e1000_init_phy_params_82571(struct e1000_hw *hw)
{
        struct e1000_phy_info *phy = &hw->phy;
        s32 ret_val;

        if (hw->phy.media_type != e1000_media_type_copper) {
                phy->type = e1000_phy_none;
                return 0;
        }

        phy->addr = 1;
        phy->autoneg_mask = AUTONEG_ADVERTISE_SPEED_DEFAULT;
        phy->reset_delay_us = 100;

        phy->ops.power_up = e1000_power_up_phy_copper;
        phy->ops.power_down = e1000_power_down_phy_copper_82571;

        switch (hw->mac.type) {
        case e1000_82571:
        case e1000_82572:
                phy->type = e1000_phy_igp_2;
                break;
        case e1000_82573:
                phy->type = e1000_phy_m88;
                break;
        case e1000_82574:
        case e1000_82583:
                phy->type = e1000_phy_bm;
                phy->ops.acquire = e1000_get_hw_semaphore_82574;
                phy->ops.release = e1000_put_hw_semaphore_82574;
                phy->ops.set_d0_lplu_state = e1000_set_d0_lplu_state_82574;
                phy->ops.set_d3_lplu_state = e1000_set_d3_lplu_state_82574;
                break;
        default:
                return -E1000_ERR_PHY;
        }

        /* This can only be done after all function pointers are setup. */
        ret_val = e1000_get_phy_id_82571(hw);
        if (ret_val) {
                e_dbg("Error getting PHY ID\n");
                return ret_val;
        }

        /* Verify phy id */
        switch (hw->mac.type) {
        case e1000_82571:
        case e1000_82572:
                if (phy->id != IGP01E1000_I_PHY_ID)
                        ret_val = -E1000_ERR_PHY;
                break;
        case e1000_82573:
                if (phy->id != M88E1111_I_PHY_ID)
                        ret_val = -E1000_ERR_PHY;
                break;
        case e1000_82574:
        case e1000_82583:
                if (phy->id != BME1000_E_PHY_ID_R2)
                        ret_val = -E1000_ERR_PHY;
                break;
        default:
                ret_val = -E1000_ERR_PHY;
                break;
        }

        if (ret_val)
                e_dbg("PHY ID unknown: type = 0x%08x\n", phy->id);

        return ret_val;
}

/**
 *  e1000_init_nvm_params_82571 - Init NVM func ptrs.
 *  @hw: pointer to the HW structure
 **/
static s32 e1000_init_nvm_params_82571(struct e1000_hw *hw)
{
        struct e1000_nvm_info *nvm = &hw->nvm;
        u32 eecd = er32(EECD);
        u16 size;

        nvm->opcode_bits = 8;
        nvm->delay_usec = 1;
        switch (nvm->override) {
        case e1000_nvm_override_spi_large:
                nvm->page_size = 32;
                nvm->address_bits = 16;
                break;
        case e1000_nvm_override_spi_small:
                nvm->page_size = 8;
                nvm->address_bits = 8;
                break;
        default:
                nvm->page_size = eecd & E1000_EECD_ADDR_BITS ? 32 : 8;
                nvm->address_bits = eecd & E1000_EECD_ADDR_BITS ? 16 : 8;
                break;
        }

        switch (hw->mac.type) {
        case e1000_82573:
        case e1000_82574:
        case e1000_82583:
                if (((eecd >> 15) & 0x3) == 0x3) {
                        nvm->type = e1000_nvm_flash_hw;
                        nvm->word_size = 2048;
                        /* Autonomous Flash update bit must be cleared due
                         * to Flash update issue.
                         */
                        eecd &= ~E1000_EECD_AUPDEN;
                        ew32(EECD, eecd);
                        break;
                }
                fallthrough;
        default:
                nvm->type = e1000_nvm_eeprom_spi;
                size = (u16)FIELD_GET(E1000_EECD_SIZE_EX_MASK, eecd);
                /* Added to a constant, "size" becomes the left-shift value
                 * for setting word_size.
                 */
                size += NVM_WORD_SIZE_BASE_SHIFT;

                /* EEPROM access above 16k is unsupported */
                if (size > 14)
                        size = 14;
                nvm->word_size = BIT(size);
                break;
        }

        /* Function Pointers */
        switch (hw->mac.type) {
        case e1000_82574:
        case e1000_82583:
                nvm->ops.acquire = e1000_get_hw_semaphore_82574;
                nvm->ops.release = e1000_put_hw_semaphore_82574;
                break;
        default:
                break;
        }

        return 0;
}

/**
 *  e1000_init_mac_params_82571 - Init MAC func ptrs.
 *  @hw: pointer to the HW structure
 **/
static s32 e1000_init_mac_params_82571(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        u32 swsm = 0;
        u32 swsm2 = 0;
        bool force_clear_smbi = false;

        /* Set media type and media-dependent function pointers */
        switch (hw->adapter->pdev->device) {
        case E1000_DEV_ID_82571EB_FIBER:
        case E1000_DEV_ID_82572EI_FIBER:
        case E1000_DEV_ID_82571EB_QUAD_FIBER:
                hw->phy.media_type = e1000_media_type_fiber;
                mac->ops.setup_physical_interface =
                    e1000_setup_fiber_serdes_link_82571;
                mac->ops.check_for_link = e1000e_check_for_fiber_link;
                mac->ops.get_link_up_info =
                    e1000e_get_speed_and_duplex_fiber_serdes;
                break;
        case E1000_DEV_ID_82571EB_SERDES:
        case E1000_DEV_ID_82571EB_SERDES_DUAL:
        case E1000_DEV_ID_82571EB_SERDES_QUAD:
        case E1000_DEV_ID_82572EI_SERDES:
                hw->phy.media_type = e1000_media_type_internal_serdes;
                mac->ops.setup_physical_interface =
                    e1000_setup_fiber_serdes_link_82571;
                mac->ops.check_for_link = e1000_check_for_serdes_link_82571;
                mac->ops.get_link_up_info =
                    e1000e_get_speed_and_duplex_fiber_serdes;
                break;
        default:
                hw->phy.media_type = e1000_media_type_copper;
                mac->ops.setup_physical_interface =
                    e1000_setup_copper_link_82571;
                mac->ops.check_for_link = e1000e_check_for_copper_link;
                mac->ops.get_link_up_info = e1000e_get_speed_and_duplex_copper;
                break;
        }

        /* Set mta register count */
        mac->mta_reg_count = 128;
        /* Set rar entry count */
        mac->rar_entry_count = E1000_RAR_ENTRIES;
        /* Adaptive IFS supported */
        mac->adaptive_ifs = true;

        /* MAC-specific function pointers */
        switch (hw->mac.type) {
        case e1000_82573:
                mac->ops.set_lan_id = e1000_set_lan_id_single_port;
                mac->ops.check_mng_mode = e1000e_check_mng_mode_generic;
                mac->ops.led_on = e1000e_led_on_generic;
                mac->ops.blink_led = e1000e_blink_led_generic;

                /* FWSM register */
                mac->has_fwsm = true;
                /* ARC supported; valid only if manageability features are
                 * enabled.
                 */
                mac->arc_subsystem_valid = !!(er32(FWSM) &
                                              E1000_FWSM_MODE_MASK);
                break;
        case e1000_82574:
        case e1000_82583:
                mac->ops.set_lan_id = e1000_set_lan_id_single_port;
                mac->ops.check_mng_mode = e1000_check_mng_mode_82574;
                mac->ops.led_on = e1000_led_on_82574;
                break;
        default:
                mac->ops.check_mng_mode = e1000e_check_mng_mode_generic;
                mac->ops.led_on = e1000e_led_on_generic;
                mac->ops.blink_led = e1000e_blink_led_generic;

                /* FWSM register */
                mac->has_fwsm = true;
                break;
        }

        /* Ensure that the inter-port SWSM.SMBI lock bit is clear before
         * first NVM or PHY access. This should be done for single-port
         * devices, and for one port only on dual-port devices so that
         * for those devices we can still use the SMBI lock to synchronize
         * inter-port accesses to the PHY & NVM.
         */
        switch (hw->mac.type) {
        case e1000_82571:
        case e1000_82572:
                swsm2 = er32(SWSM2);

                if (!(swsm2 & E1000_SWSM2_LOCK)) {
                        /* Only do this for the first interface on this card */
                        ew32(SWSM2, swsm2 | E1000_SWSM2_LOCK);
                        force_clear_smbi = true;
                } else {
                        force_clear_smbi = false;
                }
                break;
        default:
                force_clear_smbi = true;
                break;
        }

        if (force_clear_smbi) {
                /* Make sure SWSM.SMBI is clear */
                swsm = er32(SWSM);
                if (swsm & E1000_SWSM_SMBI) {
                        /* This bit should not be set on a first interface, and
                         * indicates that the bootagent or EFI code has
                         * improperly left this bit enabled
                         */
                        e_dbg("Please update your 82571 Bootagent\n");
                }
                ew32(SWSM, swsm & ~E1000_SWSM_SMBI);
        }

        /* Initialize device specific counter of SMBI acquisition timeouts. */
        hw->dev_spec.e82571.smb_counter = 0;

        return 0;
}

static s32 e1000_get_variants_82571(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        static int global_quad_port_a;  /* global port a indication */
        struct pci_dev *pdev = adapter->pdev;
        int is_port_b = er32(STATUS) & E1000_STATUS_FUNC_1;
        s32 rc;

        rc = e1000_init_mac_params_82571(hw);
        if (rc)
                return rc;

        rc = e1000_init_nvm_params_82571(hw);
        if (rc)
                return rc;

        rc = e1000_init_phy_params_82571(hw);
        if (rc)
                return rc;

        /* tag quad port adapters first, it's used below */
        switch (pdev->device) {
        case E1000_DEV_ID_82571EB_QUAD_COPPER:
        case E1000_DEV_ID_82571EB_QUAD_FIBER:
        case E1000_DEV_ID_82571EB_QUAD_COPPER_LP:
        case E1000_DEV_ID_82571PT_QUAD_COPPER:
                adapter->flags |= FLAG_IS_QUAD_PORT;
                /* mark the first port */
                if (global_quad_port_a == 0)
                        adapter->flags |= FLAG_IS_QUAD_PORT_A;
                /* Reset for multiple quad port adapters */
                global_quad_port_a++;
                if (global_quad_port_a == 4)
                        global_quad_port_a = 0;
                break;
        default:
                break;
        }

        switch (adapter->hw.mac.type) {
        case e1000_82571:
                /* these dual ports don't have WoL on port B at all */
                if (((pdev->device == E1000_DEV_ID_82571EB_FIBER) ||
                     (pdev->device == E1000_DEV_ID_82571EB_SERDES) ||
                     (pdev->device == E1000_DEV_ID_82571EB_COPPER)) &&
                    (is_port_b))
                        adapter->flags &= ~FLAG_HAS_WOL;
                /* quad ports only support WoL on port A */
                if (adapter->flags & FLAG_IS_QUAD_PORT &&
                    (!(adapter->flags & FLAG_IS_QUAD_PORT_A)))
                        adapter->flags &= ~FLAG_HAS_WOL;
                /* Does not support WoL on any port */
                if (pdev->device == E1000_DEV_ID_82571EB_SERDES_QUAD)
                        adapter->flags &= ~FLAG_HAS_WOL;
                break;
        case e1000_82573:
                if (pdev->device == E1000_DEV_ID_82573L) {
                        adapter->flags |= FLAG_HAS_JUMBO_FRAMES;
                        adapter->max_hw_frame_size = DEFAULT_JUMBO;
                }
                break;
        default:
                break;
        }

        return 0;
}

/**
 *  e1000_get_phy_id_82571 - 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.
 **/
static s32 e1000_get_phy_id_82571(struct e1000_hw *hw)
{
        struct e1000_phy_info *phy = &hw->phy;
        s32 ret_val;
        u16 phy_id = 0;

        switch (hw->mac.type) {
        case e1000_82571:
        case e1000_82572:
                /* The 82571 firmware may still be configuring the PHY.
                 * In this case, we cannot access the PHY until the
                 * configuration is done.  So we explicitly set the
                 * PHY ID.
                 */
                phy->id = IGP01E1000_I_PHY_ID;
                break;
        case e1000_82573:
                return e1000e_get_phy_id(hw);
        case e1000_82574:
        case e1000_82583:
                ret_val = e1e_rphy(hw, MII_PHYSID1, &phy_id);
                if (ret_val)
                        return ret_val;

                phy->id = (u32)(phy_id << 16);
                usleep_range(20, 40);
                ret_val = e1e_rphy(hw, MII_PHYSID2, &phy_id);
                if (ret_val)
                        return ret_val;

                phy->id |= (u32)(phy_id);
                phy->revision = (u32)(phy_id & ~PHY_REVISION_MASK);
                break;
        default:
                return -E1000_ERR_PHY;
        }

        return 0;
}

/**
 *  e1000_get_hw_semaphore_82571 - Acquire hardware semaphore
 *  @hw: pointer to the HW structure
 *
 *  Acquire the HW semaphore to access the PHY or NVM
 **/
static s32 e1000_get_hw_semaphore_82571(struct e1000_hw *hw)
{
        u32 swsm;
        s32 sw_timeout = hw->nvm.word_size + 1;
        s32 fw_timeout = hw->nvm.word_size + 1;
        s32 i = 0;

        /* If we have timedout 3 times on trying to acquire
         * the inter-port SMBI semaphore, there is old code
         * operating on the other port, and it is not
         * releasing SMBI. Modify the number of times that
         * we try for the semaphore to interwork with this
         * older code.
         */
        if (hw->dev_spec.e82571.smb_counter > 2)
                sw_timeout = 1;

        /* Get the SW semaphore */
        while (i < sw_timeout) {
                swsm = er32(SWSM);
                if (!(swsm & E1000_SWSM_SMBI))
                        break;

                usleep_range(50, 100);
                i++;
        }

        if (i == sw_timeout) {
                e_dbg("Driver can't access device - SMBI bit is set.\n");
                hw->dev_spec.e82571.smb_counter++;
        }
        /* Get the FW semaphore. */
        for (i = 0; i < fw_timeout; i++) {
                swsm = er32(SWSM);
                ew32(SWSM, swsm | E1000_SWSM_SWESMBI);

                /* Semaphore acquired if bit latched */
                if (er32(SWSM) & E1000_SWSM_SWESMBI)
                        break;

                usleep_range(50, 100);
        }

        if (i == fw_timeout) {
                /* Release semaphores */
                e1000_put_hw_semaphore_82571(hw);
                e_dbg("Driver can't access the NVM\n");
                return -E1000_ERR_NVM;
        }

        return 0;
}

/**
 *  e1000_put_hw_semaphore_82571 - Release hardware semaphore
 *  @hw: pointer to the HW structure
 *
 *  Release hardware semaphore used to access the PHY or NVM
 **/
static void e1000_put_hw_semaphore_82571(struct e1000_hw *hw)
{
        u32 swsm;

        swsm = er32(SWSM);
        swsm &= ~(E1000_SWSM_SMBI | E1000_SWSM_SWESMBI);
        ew32(SWSM, swsm);
}

/**
 *  e1000_get_hw_semaphore_82573 - Acquire hardware semaphore
 *  @hw: pointer to the HW structure
 *
 *  Acquire the HW semaphore during reset.
 *
 **/
static s32 e1000_get_hw_semaphore_82573(struct e1000_hw *hw)
{
        u32 extcnf_ctrl;
        s32 i = 0;

        extcnf_ctrl = er32(EXTCNF_CTRL);
        do {
                extcnf_ctrl |= E1000_EXTCNF_CTRL_MDIO_SW_OWNERSHIP;
                ew32(EXTCNF_CTRL, extcnf_ctrl);
                extcnf_ctrl = er32(EXTCNF_CTRL);

                if (extcnf_ctrl & E1000_EXTCNF_CTRL_MDIO_SW_OWNERSHIP)
                        break;

                usleep_range(2000, 4000);
                i++;
        } while (i < MDIO_OWNERSHIP_TIMEOUT);

        if (i == MDIO_OWNERSHIP_TIMEOUT) {
                /* Release semaphores */
                e1000_put_hw_semaphore_82573(hw);
                e_dbg("Driver can't access the PHY\n");
                return -E1000_ERR_PHY;
        }

        return 0;
}

/**
 *  e1000_put_hw_semaphore_82573 - Release hardware semaphore
 *  @hw: pointer to the HW structure
 *
 *  Release hardware semaphore used during reset.
 *
 **/
static void e1000_put_hw_semaphore_82573(struct e1000_hw *hw)
{
        u32 extcnf_ctrl;

        extcnf_ctrl = er32(EXTCNF_CTRL);
        extcnf_ctrl &= ~E1000_EXTCNF_CTRL_MDIO_SW_OWNERSHIP;
        ew32(EXTCNF_CTRL, extcnf_ctrl);
}

static DEFINE_MUTEX(swflag_mutex);

/**
 *  e1000_get_hw_semaphore_82574 - Acquire hardware semaphore
 *  @hw: pointer to the HW structure
 *
 *  Acquire the HW semaphore to access the PHY or NVM.
 *
 **/
static s32 e1000_get_hw_semaphore_82574(struct e1000_hw *hw)
{
        s32 ret_val;

        mutex_lock(&swflag_mutex);
        ret_val = e1000_get_hw_semaphore_82573(hw);
        if (ret_val)
                mutex_unlock(&swflag_mutex);
        return ret_val;
}

/**
 *  e1000_put_hw_semaphore_82574 - Release hardware semaphore
 *  @hw: pointer to the HW structure
 *
 *  Release hardware semaphore used to access the PHY or NVM
 *
 **/
static void e1000_put_hw_semaphore_82574(struct e1000_hw *hw)
{
        e1000_put_hw_semaphore_82573(hw);
        mutex_unlock(&swflag_mutex);
}

/**
 *  e1000_set_d0_lplu_state_82574 - Set Low Power Linkup D0 state
 *  @hw: pointer to the HW structure
 *  @active: true to enable LPLU, false to disable
 *
 *  Sets the LPLU D0 state according to the active flag.
 *  LPLU will not be activated unless the
 *  device autonegotiation advertisement meets standards of
 *  either 10 or 10/100 or 10/100/1000 at all duplexes.
 *  This is a function pointer entry point only called by
 *  PHY setup routines.
 **/
static s32 e1000_set_d0_lplu_state_82574(struct e1000_hw *hw, bool active)
{
        u32 data = er32(POEMB);

        if (active)
                data |= E1000_PHY_CTRL_D0A_LPLU;
        else
                data &= ~E1000_PHY_CTRL_D0A_LPLU;

        ew32(POEMB, data);
        return 0;
}

/**
 *  e1000_set_d3_lplu_state_82574 - Sets low power link up state for D3
 *  @hw: pointer to the HW structure
 *  @active: boolean used to enable/disable lplu
 *
 *  The low power link up (lplu) state is set to the power management level D3
 *  when active is true, else clear lplu for D3. LPLU
 *  is used during Dx states where the power conservation is most important.
 *  During driver activity, SmartSpeed should be enabled so performance is
 *  maintained.
 **/
static s32 e1000_set_d3_lplu_state_82574(struct e1000_hw *hw, bool active)
{
        u32 data = er32(POEMB);

        if (!active) {
                data &= ~E1000_PHY_CTRL_NOND0A_LPLU;
        } else if ((hw->phy.autoneg_advertised == E1000_ALL_SPEED_DUPLEX) ||
                   (hw->phy.autoneg_advertised == E1000_ALL_NOT_GIG) ||
                   (hw->phy.autoneg_advertised == E1000_ALL_10_SPEED)) {
                data |= E1000_PHY_CTRL_NOND0A_LPLU;
        }

        ew32(POEMB, data);
        return 0;
}

/**
 *  e1000_acquire_nvm_82571 - Request for access to the EEPROM
 *  @hw: pointer to the HW structure
 *
 *  To gain access to the EEPROM, first we must obtain a hardware semaphore.
 *  Then for non-82573 hardware, set the EEPROM access request bit and wait
 *  for EEPROM access grant bit.  If the access grant bit is not set, release
 *  hardware semaphore.
 **/
static s32 e1000_acquire_nvm_82571(struct e1000_hw *hw)
{
        s32 ret_val;

        ret_val = e1000_get_hw_semaphore_82571(hw);
        if (ret_val)
                return ret_val;

        switch (hw->mac.type) {
        case e1000_82573:
                break;
        default:
                ret_val = e1000e_acquire_nvm(hw);
                break;
        }

        if (ret_val)
                e1000_put_hw_semaphore_82571(hw);

        return ret_val;
}

/**
 *  e1000_release_nvm_82571 - Release exclusive access to EEPROM
 *  @hw: pointer to the HW structure
 *
 *  Stop any current commands to the EEPROM and clear the EEPROM request bit.
 **/
static void e1000_release_nvm_82571(struct e1000_hw *hw)
{
        e1000e_release_nvm(hw);
        e1000_put_hw_semaphore_82571(hw);
}

/**
 *  e1000_write_nvm_82571 - Write to EEPROM using appropriate interface
 *  @hw: pointer to the HW structure
 *  @offset: offset within the EEPROM to be written to
 *  @words: number of words to write
 *  @data: 16 bit word(s) to be written to the EEPROM
 *
 *  For non-82573 silicon, write data to EEPROM at offset using SPI interface.
 *
 *  If e1000e_update_nvm_checksum is not called after this function, the
 *  EEPROM will most likely contain an invalid checksum.
 **/
static s32 e1000_write_nvm_82571(struct e1000_hw *hw, u16 offset, u16 words,
                                 u16 *data)
{
        s32 ret_val;

        switch (hw->mac.type) {
        case e1000_82573:
        case e1000_82574:
        case e1000_82583:
                ret_val = e1000_write_nvm_eewr_82571(hw, offset, words, data);
                break;
        case e1000_82571:
        case e1000_82572:
                ret_val = e1000e_write_nvm_spi(hw, offset, words, data);
                break;
        default:
                ret_val = -E1000_ERR_NVM;
                break;
        }

        return ret_val;
}

/**
 *  e1000_update_nvm_checksum_82571 - Update EEPROM checksum
 *  @hw: pointer to the HW structure
 *
 *  Updates the EEPROM checksum by reading/adding each word of the EEPROM
 *  up to the checksum.  Then calculates the EEPROM checksum and writes the
 *  value to the EEPROM.
 **/
static s32 e1000_update_nvm_checksum_82571(struct e1000_hw *hw)
{
        u32 eecd;
        s32 ret_val;
        u16 i;

        ret_val = e1000e_update_nvm_checksum_generic(hw);
        if (ret_val)
                return ret_val;

        /* If our nvm is an EEPROM, then we're done
         * otherwise, commit the checksum to the flash NVM.
         */
        if (hw->nvm.type != e1000_nvm_flash_hw)
                return 0;

        /* Check for pending operations. */
        for (i = 0; i < E1000_FLASH_UPDATES; i++) {
                usleep_range(1000, 2000);
                if (!(er32(EECD) & E1000_EECD_FLUPD))
                        break;
        }

        if (i == E1000_FLASH_UPDATES)
                return -E1000_ERR_NVM;

        /* Reset the firmware if using STM opcode. */
        if ((er32(FLOP) & 0xFF00) == E1000_STM_OPCODE) {
                /* The enabling of and the actual reset must be done
                 * in two write cycles.
                 */
                ew32(HICR, E1000_HICR_FW_RESET_ENABLE);
                e1e_flush();
                ew32(HICR, E1000_HICR_FW_RESET);
        }

        /* Commit the write to flash */
        eecd = er32(EECD) | E1000_EECD_FLUPD;
        ew32(EECD, eecd);

        for (i = 0; i < E1000_FLASH_UPDATES; i++) {
                usleep_range(1000, 2000);
                if (!(er32(EECD) & E1000_EECD_FLUPD))
                        break;
        }

        if (i == E1000_FLASH_UPDATES)
                return -E1000_ERR_NVM;

        return 0;
}

/**
 *  e1000_validate_nvm_checksum_82571 - Validate EEPROM checksum
 *  @hw: pointer to the HW structure
 *
 *  Calculates the EEPROM checksum by reading/adding each word of the EEPROM
 *  and then verifies that the sum of the EEPROM is equal to 0xBABA.
 **/
static s32 e1000_validate_nvm_checksum_82571(struct e1000_hw *hw)
{
        if (hw->nvm.type == e1000_nvm_flash_hw)
                e1000_fix_nvm_checksum_82571(hw);

        return e1000e_validate_nvm_checksum_generic(hw);
}

/**
 *  e1000_write_nvm_eewr_82571 - Write to EEPROM for 82573 silicon
 *  @hw: pointer to the HW structure
 *  @offset: offset within the EEPROM to be written to
 *  @words: number of words to write
 *  @data: 16 bit word(s) to be written to the EEPROM
 *
 *  After checking for invalid values, poll the EEPROM to ensure the previous
 *  command has completed before trying to write the next word.  After write
 *  poll for completion.
 *
 *  If e1000e_update_nvm_checksum is not called after this function, the
 *  EEPROM will most likely contain an invalid checksum.
 **/
static s32 e1000_write_nvm_eewr_82571(struct e1000_hw *hw, u16 offset,
                                      u16 words, u16 *data)
{
        struct e1000_nvm_info *nvm = &hw->nvm;
        u32 i, eewr = 0;
        s32 ret_val = 0;

        /* A check for invalid values:  offset too large, too many words,
         * and not enough words.
         */
        if ((offset >= nvm->word_size) || (words > (nvm->word_size - offset)) ||
            (words == 0)) {
                e_dbg("nvm parameter(s) out of bounds\n");
                return -E1000_ERR_NVM;
        }

        for (i = 0; i < words; i++) {
                eewr = ((data[i] << E1000_NVM_RW_REG_DATA) |
                        ((offset + i) << E1000_NVM_RW_ADDR_SHIFT) |
                        E1000_NVM_RW_REG_START);

                ret_val = e1000e_poll_eerd_eewr_done(hw, E1000_NVM_POLL_WRITE);
                if (ret_val)
                        break;

                ew32(EEWR, eewr);

                ret_val = e1000e_poll_eerd_eewr_done(hw, E1000_NVM_POLL_WRITE);
                if (ret_val)
                        break;
        }

        return ret_val;
}

/**
 *  e1000_get_cfg_done_82571 - Poll for configuration done
 *  @hw: pointer to the HW structure
 *
 *  Reads the management control register for the config done bit to be set.
 **/
static s32 e1000_get_cfg_done_82571(struct e1000_hw *hw)
{
        s32 timeout = PHY_CFG_TIMEOUT;

        while (timeout) {
                if (er32(EEMNGCTL) & E1000_NVM_CFG_DONE_PORT_0)
                        break;
                usleep_range(1000, 2000);
                timeout--;
        }
        if (!timeout) {
                e_dbg("MNG configuration cycle has not completed.\n");
                return -E1000_ERR_RESET;
        }

        return 0;
}

/**
 *  e1000_set_d0_lplu_state_82571 - Set Low Power Linkup D0 state
 *  @hw: pointer to the HW structure
 *  @active: true to enable LPLU, false to disable
 *
 *  Sets the LPLU D0 state according to the active flag.  When activating LPLU
 *  this function also disables smart speed and vice versa.  LPLU will not be
 *  activated unless the device autonegotiation advertisement meets standards
 *  of either 10 or 10/100 or 10/100/1000 at all duplexes.  This is a function
 *  pointer entry point only called by PHY setup routines.
 **/
static s32 e1000_set_d0_lplu_state_82571(struct e1000_hw *hw, bool active)
{
        struct e1000_phy_info *phy = &hw->phy;
        s32 ret_val;
        u16 data;

        ret_val = e1e_rphy(hw, IGP02E1000_PHY_POWER_MGMT, &data);
        if (ret_val)
                return ret_val;

        if (active) {
                data |= IGP02E1000_PM_D0_LPLU;
                ret_val = e1e_wphy(hw, IGP02E1000_PHY_POWER_MGMT, data);
                if (ret_val)
                        return ret_val;

                /* When LPLU is enabled, we should disable SmartSpeed */
                ret_val = e1e_rphy(hw, IGP01E1000_PHY_PORT_CONFIG, &data);
                if (ret_val)
                        return ret_val;
                data &= ~IGP01E1000_PSCFR_SMART_SPEED;
                ret_val = e1e_wphy(hw, IGP01E1000_PHY_PORT_CONFIG, data);
                if (ret_val)
                        return ret_val;
        } else {
                data &= ~IGP02E1000_PM_D0_LPLU;
                ret_val = e1e_wphy(hw, IGP02E1000_PHY_POWER_MGMT, data);
                if (ret_val)
                        return ret_val;
                /* LPLU and SmartSpeed are mutually exclusive.  LPLU is used
                 * during Dx states where the power conservation is most
                 * important.  During driver activity we should enable
                 * SmartSpeed, so performance is maintained.
                 */
                if (phy->smart_speed == e1000_smart_speed_on) {
                        ret_val = e1e_rphy(hw, IGP01E1000_PHY_PORT_CONFIG,
                                           &data);
                        if (ret_val)
                                return ret_val;

                        data |= IGP01E1000_PSCFR_SMART_SPEED;
                        ret_val = e1e_wphy(hw, IGP01E1000_PHY_PORT_CONFIG,
                                           data);
                        if (ret_val)
                                return ret_val;
                } else if (phy->smart_speed == e1000_smart_speed_off) {
                        ret_val = e1e_rphy(hw, IGP01E1000_PHY_PORT_CONFIG,
                                           &data);
                        if (ret_val)
                                return ret_val;

                        data &= ~IGP01E1000_PSCFR_SMART_SPEED;
                        ret_val = e1e_wphy(hw, IGP01E1000_PHY_PORT_CONFIG,
                                           data);
                        if (ret_val)
                                return ret_val;
                }
        }

        return 0;
}

/**
 *  e1000_reset_hw_82571 - Reset hardware
 *  @hw: pointer to the HW structure
 *
 *  This resets the hardware into a known state.
 **/
static s32 e1000_reset_hw_82571(struct e1000_hw *hw)
{
        u32 ctrl, ctrl_ext, eecd, tctl;
        s32 ret_val;

        /* Prevent the PCI-E bus from sticking if there is no TLP connection
         * on the last TLP read/write transaction when MAC is reset.
         */
        ret_val = e1000e_disable_pcie_master(hw);
        if (ret_val)
                e_dbg("PCI-E Master disable polling has failed.\n");

        e_dbg("Masking off all interrupts\n");
        ew32(IMC, 0xffffffff);

        ew32(RCTL, 0);
        tctl = er32(TCTL);
        tctl &= ~E1000_TCTL_EN;
        ew32(TCTL, tctl);
        e1e_flush();

        usleep_range(10000, 11000);

        /* Must acquire the MDIO ownership before MAC reset.
         * Ownership defaults to firmware after a reset.
         */
        switch (hw->mac.type) {
        case e1000_82573:
                ret_val = e1000_get_hw_semaphore_82573(hw);
                break;
        case e1000_82574:
        case e1000_82583:
                ret_val = e1000_get_hw_semaphore_82574(hw);
                break;
        default:
                break;
        }

        ctrl = er32(CTRL);

        e_dbg("Issuing a global reset to MAC\n");
        ew32(CTRL, ctrl | E1000_CTRL_RST);

        /* Must release MDIO ownership and mutex after MAC reset. */
        switch (hw->mac.type) {
        case e1000_82573:
                /* Release mutex only if the hw semaphore is acquired */
                if (!ret_val)
                        e1000_put_hw_semaphore_82573(hw);
                break;
        case e1000_82574:
        case e1000_82583:
                /* Release mutex only if the hw semaphore is acquired */
                if (!ret_val)
                        e1000_put_hw_semaphore_82574(hw);
                break;
        default:
                break;
        }

        if (hw->nvm.type == e1000_nvm_flash_hw) {
                usleep_range(10, 20);
                ctrl_ext = er32(CTRL_EXT);
                ctrl_ext |= E1000_CTRL_EXT_EE_RST;
                ew32(CTRL_EXT, ctrl_ext);
                e1e_flush();
        }

        ret_val = e1000e_get_auto_rd_done(hw);
        if (ret_val)
                /* We don't want to continue accessing MAC registers. */
                return ret_val;

        /* Phy configuration from NVM just starts after EECD_AUTO_RD is set.
         * Need to wait for Phy configuration completion before accessing
         * NVM and Phy.
         */

        switch (hw->mac.type) {
        case e1000_82571:
        case e1000_82572:
                /* REQ and GNT bits need to be cleared when using AUTO_RD
                 * to access the EEPROM.
                 */
                eecd = er32(EECD);
                eecd &= ~(E1000_EECD_REQ | E1000_EECD_GNT);
                ew32(EECD, eecd);
                break;
        case e1000_82573:
        case e1000_82574:
        case e1000_82583:
                msleep(25);
                break;
        default:
                break;
        }

        /* Clear any pending interrupt events. */
        ew32(IMC, 0xffffffff);
        er32(ICR);

        if (hw->mac.type == e1000_82571) {
                /* Install any alternate MAC address into RAR0 */
                ret_val = e1000_check_alt_mac_addr_generic(hw);
                if (ret_val)
                        return ret_val;

                e1000e_set_laa_state_82571(hw, true);
        }

        /* Reinitialize the 82571 serdes link state machine */
        if (hw->phy.media_type == e1000_media_type_internal_serdes)
                hw->mac.serdes_link_state = e1000_serdes_link_down;

        return 0;
}

/**
 *  e1000_init_hw_82571 - Initialize hardware
 *  @hw: pointer to the HW structure
 *
 *  This inits the hardware readying it for operation.
 **/
static s32 e1000_init_hw_82571(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        u32 reg_data;
        s32 ret_val;
        u16 i, rar_count = mac->rar_entry_count;

        e1000_initialize_hw_bits_82571(hw);

        /* Initialize identification LED */
        ret_val = mac->ops.id_led_init(hw);
        /* An error is not fatal and we should not stop init due to this */
        if (ret_val)
                e_dbg("Error initializing identification LED\n");

        /* Disabling VLAN filtering */
        e_dbg("Initializing the IEEE VLAN\n");
        mac->ops.clear_vfta(hw);

        /* Setup the receive address.
         * If, however, a locally administered address was assigned to the
         * 82571, we must reserve a RAR for it to work around an issue where
         * resetting one port will reload the MAC on the other port.
         */
        if (e1000e_get_laa_state_82571(hw))
                rar_count--;
        e1000e_init_rx_addrs(hw, rar_count);

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

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

        /* Set the transmit descriptor write-back policy */
        reg_data = er32(TXDCTL(0));
        reg_data = ((reg_data & ~E1000_TXDCTL_WTHRESH) |
                    E1000_TXDCTL_FULL_TX_DESC_WB | E1000_TXDCTL_COUNT_DESC);
        ew32(TXDCTL(0), reg_data);

        /* ...for both queues. */
        switch (mac->type) {
        case e1000_82573:
                e1000e_enable_tx_pkt_filtering(hw);
                fallthrough;
        case e1000_82574:
        case e1000_82583:
                reg_data = er32(GCR);
                reg_data |= E1000_GCR_L1_ACT_WITHOUT_L0S_RX;
                ew32(GCR, reg_data);
                break;
        default:
                reg_data = er32(TXDCTL(1));
                reg_data = ((reg_data & ~E1000_TXDCTL_WTHRESH) |
                            E1000_TXDCTL_FULL_TX_DESC_WB |
                            E1000_TXDCTL_COUNT_DESC);
                ew32(TXDCTL(1), reg_data);
                break;
        }

        /* 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_82571(hw);

        return ret_val;
}

/**
 *  e1000_initialize_hw_bits_82571 - Initialize hardware-dependent bits
 *  @hw: pointer to the HW structure
 *
 *  Initializes required hardware-dependent bits needed for normal operation.
 **/
static void e1000_initialize_hw_bits_82571(struct e1000_hw *hw)
{
        u32 reg;

        /* Transmit Descriptor Control 0 */
        reg = er32(TXDCTL(0));
        reg |= BIT(22);
        ew32(TXDCTL(0), reg);

        /* Transmit Descriptor Control 1 */
        reg = er32(TXDCTL(1));
        reg |= BIT(22);
        ew32(TXDCTL(1), reg);

        /* Transmit Arbitration Control 0 */
        reg = er32(TARC(0));
        reg &= ~(0xF << 27);    /* 30:27 */
        switch (hw->mac.type) {
        case e1000_82571:
        case e1000_82572:
                reg |= BIT(23) | BIT(24) | BIT(25) | BIT(26);
                break;
        case e1000_82574:
        case e1000_82583:
                reg |= BIT(26);
                break;
        default:
                break;
        }
        ew32(TARC(0), reg);

        /* Transmit Arbitration Control 1 */
        reg = er32(TARC(1));
        switch (hw->mac.type) {
        case e1000_82571:
        case e1000_82572:
                reg &= ~(BIT(29) | BIT(30));
                reg |= BIT(22) | BIT(24) | BIT(25) | BIT(26);
                if (er32(TCTL) & E1000_TCTL_MULR)
                        reg &= ~BIT(28);
                else
                        reg |= BIT(28);
                ew32(TARC(1), reg);
                break;
        default:
                break;
        }

        /* Device Control */
        switch (hw->mac.type) {
        case e1000_82573:
        case e1000_82574:
        case e1000_82583:
                reg = er32(CTRL);
                reg &= ~BIT(29);
                ew32(CTRL, reg);
                break;
        default:
                break;
        }

        /* Extended Device Control */
        switch (hw->mac.type) {
        case e1000_82573:
        case e1000_82574:
        case e1000_82583:
                reg = er32(CTRL_EXT);
                reg &= ~BIT(23);
                reg |= BIT(22);
                ew32(CTRL_EXT, reg);
                break;
        default:
                break;
        }

        if (hw->mac.type == e1000_82571) {
                reg = er32(PBA_ECC);
                reg |= E1000_PBA_ECC_CORR_EN;
                ew32(PBA_ECC, reg);
        }

        /* Workaround for hardware errata.
         * Ensure that DMA Dynamic Clock gating is disabled on 82571 and 82572
         */
        if ((hw->mac.type == e1000_82571) || (hw->mac.type == e1000_82572)) {
                reg = er32(CTRL_EXT);
                reg &= ~E1000_CTRL_EXT_DMA_DYN_CLK_EN;
                ew32(CTRL_EXT, reg);
        }

        /* Disable IPv6 extension header parsing because some malformed
         * IPv6 headers can hang the Rx.
         */
        if (hw->mac.type <= e1000_82573) {
                reg = er32(RFCTL);
                reg |= (E1000_RFCTL_IPV6_EX_DIS | E1000_RFCTL_NEW_IPV6_EXT_DIS);
                ew32(RFCTL, reg);
        }

        /* PCI-Ex Control Registers */
        switch (hw->mac.type) {
        case e1000_82574:
        case e1000_82583:
                reg = er32(GCR);
                reg |= BIT(22);
                ew32(GCR, reg);

                /* Workaround for hardware errata.
                 * apply workaround for hardware errata documented in errata
                 * docs Fixes issue where some error prone or unreliable PCIe
                 * completions are occurring, particularly with ASPM enabled.
                 * Without fix, issue can cause Tx timeouts.
                 */
                reg = er32(GCR2);
                reg |= 1;
                ew32(GCR2, reg);
                break;
        default:
                break;
        }
}

/**
 *  e1000_clear_vfta_82571 - Clear VLAN filter table
 *  @hw: pointer to the HW structure
 *
 *  Clears the register array which contains the VLAN filter table by
 *  setting all the values to 0.
 **/
static void e1000_clear_vfta_82571(struct e1000_hw *hw)
{
        u32 offset;
        u32 vfta_value = 0;
        u32 vfta_offset = 0;
        u32 vfta_bit_in_reg = 0;

        switch (hw->mac.type) {
        case e1000_82573:
        case e1000_82574:
        case e1000_82583:
                if (hw->mng_cookie.vlan_id != 0) {
                        /* The VFTA is a 4096b bit-field, each identifying
                         * a single VLAN ID.  The following operations
                         * determine which 32b entry (i.e. offset) into the
                         * array we want to set the VLAN ID (i.e. bit) of
                         * the manageability unit.
                         */
                        vfta_offset = (hw->mng_cookie.vlan_id >>
                                       E1000_VFTA_ENTRY_SHIFT) &
                            E1000_VFTA_ENTRY_MASK;
                        vfta_bit_in_reg =
                            BIT(hw->mng_cookie.vlan_id &
                                E1000_VFTA_ENTRY_BIT_SHIFT_MASK);
                }
                break;
        default:
                break;
        }
        for (offset = 0; offset < E1000_VLAN_FILTER_TBL_SIZE; offset++) {
                /* If the offset we want to clear is the same offset of the
                 * manageability VLAN ID, then clear all bits except that of
                 * the manageability unit.
                 */
                vfta_value = (offset == vfta_offset) ? vfta_bit_in_reg : 0;
                E1000_WRITE_REG_ARRAY(hw, E1000_VFTA, offset, vfta_value);
                e1e_flush();
        }
}

/**
 *  e1000_check_mng_mode_82574 - Check manageability is enabled
 *  @hw: pointer to the HW structure
 *
 *  Reads the NVM Initialization Control Word 2 and returns true
 *  (>0) if any manageability is enabled, else false (0).
 **/
static bool e1000_check_mng_mode_82574(struct e1000_hw *hw)
{
        u16 data;

        e1000_read_nvm(hw, NVM_INIT_CONTROL2_REG, 1, &data);
        return (data & E1000_NVM_INIT_CTRL2_MNGM) != 0;
}

/**
 *  e1000_led_on_82574 - Turn LED on
 *  @hw: pointer to the HW structure
 *
 *  Turn LED on.
 **/
static s32 e1000_led_on_82574(struct e1000_hw *hw)
{
        u32 ctrl;
        u32 i;

        ctrl = hw->mac.ledctl_mode2;
        if (!(E1000_STATUS_LU & er32(STATUS))) {
                /* If no link, then turn LED on by setting the invert bit
                 * for each LED that's "on" (0x0E) in ledctl_mode2.
                 */
                for (i = 0; i < 4; i++)
                        if (((hw->mac.ledctl_mode2 >> (i * 8)) & 0xFF) ==
                            E1000_LEDCTL_MODE_LED_ON)
                                ctrl |= (E1000_LEDCTL_LED0_IVRT << (i * 8));
        }
        ew32(LEDCTL, ctrl);

        return 0;
}

/**
 *  e1000_check_phy_82574 - check 82574 phy hung state
 *  @hw: pointer to the HW structure
 *
 *  Returns whether phy is hung or not
 **/
bool e1000_check_phy_82574(struct e1000_hw *hw)
{
        u16 status_1kbt = 0;
        u16 receive_errors = 0;
        s32 ret_val;

        /* Read PHY Receive Error counter first, if its is max - all F's then
         * read the Base1000T status register If both are max then PHY is hung.
         */
        ret_val = e1e_rphy(hw, E1000_RECEIVE_ERROR_COUNTER, &receive_errors);
        if (ret_val)
                return false;
        if (receive_errors == E1000_RECEIVE_ERROR_MAX) {
                ret_val = e1e_rphy(hw, E1000_BASE1000T_STATUS, &status_1kbt);
                if (ret_val)
                        return false;
                if ((status_1kbt & E1000_IDLE_ERROR_COUNT_MASK) ==
                    E1000_IDLE_ERROR_COUNT_MASK)
                        return true;
        }

        return false;
}

/**
 *  e1000_setup_link_82571 - Setup flow control and link settings
 *  @hw: pointer to the HW structure
 *
 *  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_82571(struct e1000_hw *hw)
{
        /* 82573 does not have a word in the NVM to determine
         * the default flow control setting, so we explicitly
         * set it to full.
         */
        switch (hw->mac.type) {
        case e1000_82573:
        case e1000_82574:
        case e1000_82583:
                if (hw->fc.requested_mode == e1000_fc_default)
                        hw->fc.requested_mode = e1000_fc_full;
                break;
        default:
                break;
        }

        return e1000e_setup_link_generic(hw);
}

/**
 *  e1000_setup_copper_link_82571 - 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_82571(struct e1000_hw *hw)
{
        u32 ctrl;
        s32 ret_val;

        ctrl = er32(CTRL);
        ctrl |= E1000_CTRL_SLU;
        ctrl &= ~(E1000_CTRL_FRCSPD | E1000_CTRL_FRCDPX);
        ew32(CTRL, ctrl);

        switch (hw->phy.type) {
        case e1000_phy_m88:
        case e1000_phy_bm:
                ret_val = e1000e_copper_link_setup_m88(hw);
                break;
        case e1000_phy_igp_2:
                ret_val = e1000e_copper_link_setup_igp(hw);
                break;
        default:
                return -E1000_ERR_PHY;
        }

        if (ret_val)
                return ret_val;

        return e1000e_setup_copper_link(hw);
}

/**
 *  e1000_setup_fiber_serdes_link_82571 - Setup link for fiber/serdes
 *  @hw: pointer to the HW structure
 *
 *  Configures collision distance and flow control for fiber and serdes links.
 *  Upon successful setup, poll for link.
 **/
static s32 e1000_setup_fiber_serdes_link_82571(struct e1000_hw *hw)
{
        switch (hw->mac.type) {
        case e1000_82571:
        case e1000_82572:
                /* If SerDes loopback mode is entered, there is no form
                 * of reset to take the adapter out of that mode.  So we
                 * have to explicitly take the adapter out of loopback
                 * mode.  This prevents drivers from twiddling their thumbs
                 * if another tool failed to take it out of loopback mode.
                 */
                ew32(SCTL, E1000_SCTL_DISABLE_SERDES_LOOPBACK);
                break;
        default:
                break;
        }

        return e1000e_setup_fiber_serdes_link(hw);
}

/**
 *  e1000_check_for_serdes_link_82571 - Check for link (Serdes)
 *  @hw: pointer to the HW structure
 *
 *  Reports the link state as up or down.
 *
 *  If autonegotiation is supported by the link partner, the link state is
 *  determined by the result of autonegotiation. This is the most likely case.
 *  If autonegotiation is not supported by the link partner, and the link
 *  has a valid signal, force the link up.
 *
 *  The link state is represented internally here by 4 states:
 *
 *  1) down
 *  2) autoneg_progress
 *  3) autoneg_complete (the link successfully autonegotiated)
 *  4) forced_up (the link has been forced up, it did not autonegotiate)
 *
 **/
static s32 e1000_check_for_serdes_link_82571(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        u32 rxcw;
        u32 ctrl;
        u32 status;
        u32 txcw;
        u32 i;
        s32 ret_val = 0;

        ctrl = er32(CTRL);
        status = er32(STATUS);
        er32(RXCW);
        /* SYNCH bit and IV bit are sticky */
        usleep_range(10, 20);
        rxcw = er32(RXCW);

        if ((rxcw & E1000_RXCW_SYNCH) && !(rxcw & E1000_RXCW_IV)) {
                /* Receiver is synchronized with no invalid bits.  */
                switch (mac->serdes_link_state) {
                case e1000_serdes_link_autoneg_complete:
                        if (!(status & E1000_STATUS_LU)) {
                                /* We have lost link, retry autoneg before
                                 * reporting link failure
                                 */
                                mac->serdes_link_state =
                                    e1000_serdes_link_autoneg_progress;
                                mac->serdes_has_link = false;
                                e_dbg("AN_UP     -> AN_PROG\n");
                        } else {
                                mac->serdes_has_link = true;
                        }
                        break;

                case e1000_serdes_link_forced_up:
                        /* If 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.
                         */
                        if (rxcw & E1000_RXCW_C) {
                                /* Enable autoneg, and unforce link up */
                                ew32(TXCW, mac->txcw);
                                ew32(CTRL, (ctrl & ~E1000_CTRL_SLU));
                                mac->serdes_link_state =
                                    e1000_serdes_link_autoneg_progress;
                                mac->serdes_has_link = false;
                                e_dbg("FORCED_UP -> AN_PROG\n");
                        } else {
                                mac->serdes_has_link = true;
                        }
                        break;

                case e1000_serdes_link_autoneg_progress:
                        if (rxcw & E1000_RXCW_C) {
                                /* We received /C/ ordered sets, meaning the
                                 * link partner has autonegotiated, and we can
                                 * trust the Link Up (LU) status bit.
                                 */
                                if (status & E1000_STATUS_LU) {
                                        mac->serdes_link_state =
                                            e1000_serdes_link_autoneg_complete;
                                        e_dbg("AN_PROG   -> AN_UP\n");
                                        mac->serdes_has_link = true;
                                } else {
                                        /* Autoneg completed, but failed. */
                                        mac->serdes_link_state =
                                            e1000_serdes_link_down;
                                        e_dbg("AN_PROG   -> DOWN\n");
                                }
                        } else {
                                /* The link partner did not autoneg.
                                 * Force link up and full duplex, and change
                                 * state to forced.
                                 */
                                ew32(TXCW, (mac->txcw & ~E1000_TXCW_ANE));
                                ctrl |= (E1000_CTRL_SLU | E1000_CTRL_FD);
                                ew32(CTRL, ctrl);

                                /* Configure Flow Control after link up. */
                                ret_val = e1000e_config_fc_after_link_up(hw);
                                if (ret_val) {
                                        e_dbg("Error config flow control\n");
                                        break;
                                }
                                mac->serdes_link_state =
                                    e1000_serdes_link_forced_up;
                                mac->serdes_has_link = true;
                                e_dbg("AN_PROG   -> FORCED_UP\n");
                        }
                        break;

                case e1000_serdes_link_down:
                default:
                        /* The link was down but the receiver has now gained
                         * valid sync, so lets see if we can bring the link
                         * up.
                         */
                        ew32(TXCW, mac->txcw);
                        ew32(CTRL, (ctrl & ~E1000_CTRL_SLU));
                        mac->serdes_link_state =
                            e1000_serdes_link_autoneg_progress;
                        mac->serdes_has_link = false;
                        e_dbg("DOWN      -> AN_PROG\n");
                        break;
                }
        } else {
                if (!(rxcw & E1000_RXCW_SYNCH)) {
                        mac->serdes_has_link = false;
                        mac->serdes_link_state = e1000_serdes_link_down;
                        e_dbg("ANYSTATE  -> DOWN\n");
                } else {
                        /* Check several times, if SYNCH bit and CONFIG
                         * bit both are consistently 1 then simply ignore
                         * the IV bit and restart Autoneg
                         */
                        for (i = 0; i < AN_RETRY_COUNT; i++) {
                                usleep_range(10, 20);
                                rxcw = er32(RXCW);
                                if ((rxcw & E1000_RXCW_SYNCH) &&
                                    (rxcw & E1000_RXCW_C))
                                        continue;

                                if (rxcw & E1000_RXCW_IV) {
                                        mac->serdes_has_link = false;
                                        mac->serdes_link_state =
                                            e1000_serdes_link_down;
                                        e_dbg("ANYSTATE  -> DOWN\n");
                                        break;
                                }
                        }

                        if (i == AN_RETRY_COUNT) {
                                txcw = er32(TXCW);
                                txcw |= E1000_TXCW_ANE;
                                ew32(TXCW, txcw);
                                mac->serdes_link_state =
                                    e1000_serdes_link_autoneg_progress;
                                mac->serdes_has_link = false;
                                e_dbg("ANYSTATE  -> AN_PROG\n");
                        }
                }
        }

        return ret_val;
}

/**
 *  e1000_valid_led_default_82571 - Verify a valid default LED config
 *  @hw: pointer to the HW structure
 *  @data: pointer to the NVM (EEPROM)
 *
 *  Read the EEPROM for the current default LED configuration.  If the
 *  LED configuration is not valid, set to a valid LED configuration.
 **/
static s32 e1000_valid_led_default_82571(struct e1000_hw *hw, u16 *data)
{
        s32 ret_val;

        ret_val = e1000_read_nvm(hw, NVM_ID_LED_SETTINGS, 1, data);
        if (ret_val) {
                e_dbg("NVM Read Error\n");
                return ret_val;
        }

        switch (hw->mac.type) {
        case e1000_82573:
        case e1000_82574:
        case e1000_82583:
                if (*data == ID_LED_RESERVED_F746)
                        *data = ID_LED_DEFAULT_82573;
                break;
        default:
                if (*data == ID_LED_RESERVED_0000 ||
                    *data == ID_LED_RESERVED_FFFF)
                        *data = ID_LED_DEFAULT;
                break;
        }

        return 0;
}

/**
 *  e1000e_get_laa_state_82571 - Get locally administered address state
 *  @hw: pointer to the HW structure
 *
 *  Retrieve and return the current locally administered address state.
 **/
bool e1000e_get_laa_state_82571(struct e1000_hw *hw)
{
        if (hw->mac.type != e1000_82571)
                return false;

        return hw->dev_spec.e82571.laa_is_present;
}

/**
 *  e1000e_set_laa_state_82571 - Set locally administered address state
 *  @hw: pointer to the HW structure
 *  @state: enable/disable locally administered address
 *
 *  Enable/Disable the current locally administered address state.
 **/
void e1000e_set_laa_state_82571(struct e1000_hw *hw, bool state)
{
        if (hw->mac.type != e1000_82571)
                return;

        hw->dev_spec.e82571.laa_is_present = state;

        /* If workaround is activated... */
        if (state)
                /* Hold a copy of the LAA in RAR[14] This is done so that
                 * between the time RAR[0] gets clobbered and the time it
                 * gets fixed, the actual LAA is in one of the RARs and no
                 * incoming packets directed to this port are dropped.
                 * Eventually the LAA will be in RAR[0] and RAR[14].
                 */
                hw->mac.ops.rar_set(hw, hw->mac.addr,
                                    hw->mac.rar_entry_count - 1);
}

/**
 *  e1000_fix_nvm_checksum_82571 - Fix EEPROM checksum
 *  @hw: pointer to the HW structure
 *
 *  Verifies that the EEPROM has completed the update.  After updating the
 *  EEPROM, we need to check bit 15 in work 0x23 for the checksum fix.  If
 *  the checksum fix is not implemented, we need to set the bit and update
 *  the checksum.  Otherwise, if bit 15 is set and the checksum is incorrect,
 *  we need to return bad checksum.
 **/
static s32 e1000_fix_nvm_checksum_82571(struct e1000_hw *hw)
{
        struct e1000_nvm_info *nvm = &hw->nvm;
        s32 ret_val;
        u16 data;

        if (nvm->type != e1000_nvm_flash_hw)
                return 0;

        /* Check bit 4 of word 10h.  If it is 0, firmware is done updating
         * 10h-12h.  Checksum may need to be fixed.
         */
        ret_val = e1000_read_nvm(hw, 0x10, 1, &data);
        if (ret_val)
                return ret_val;

        if (!(data & 0x10)) {
                /* Read 0x23 and check bit 15.  This bit is a 1
                 * when the checksum has already been fixed.  If
                 * the checksum is still wrong and this bit is a
                 * 1, we need to return bad checksum.  Otherwise,
                 * we need to set this bit to a 1 and update the
                 * checksum.
                 */
                ret_val = e1000_read_nvm(hw, 0x23, 1, &data);
                if (ret_val)
                        return ret_val;

                if (!(data & 0x8000)) {
                        data |= 0x8000;
                        ret_val = e1000_write_nvm(hw, 0x23, 1, &data);
                        if (ret_val)
                                return ret_val;
                        ret_val = e1000e_update_nvm_checksum(hw);
                        if (ret_val)
                                return ret_val;
                }
        }

        return 0;
}

/**
 *  e1000_read_mac_addr_82571 - Read device MAC address
 *  @hw: pointer to the HW structure
 **/
static s32 e1000_read_mac_addr_82571(struct e1000_hw *hw)
{
        if (hw->mac.type == e1000_82571) {
                s32 ret_val;

                /* If there's an alternate MAC address place it in RAR0
                 * so that it will override the Si installed default perm
                 * address.
                 */
                ret_val = e1000_check_alt_mac_addr_generic(hw);
                if (ret_val)
                        return ret_val;
        }

        return e1000_read_mac_addr_generic(hw);
}

/**
 * e1000_power_down_phy_copper_82571 - Remove link during 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, remove the link.
 **/
static void e1000_power_down_phy_copper_82571(struct e1000_hw *hw)
{
        struct e1000_phy_info *phy = &hw->phy;
        struct e1000_mac_info *mac = &hw->mac;

        if (!phy->ops.check_reset_block)
                return;

        /* If the management interface is not enabled, then power down */
        if (!(mac->ops.check_mng_mode(hw) || phy->ops.check_reset_block(hw)))
                e1000_power_down_phy_copper(hw);
}

/**
 *  e1000_clear_hw_cntrs_82571 - 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_82571(struct e1000_hw *hw)
{
        e1000e_clear_hw_cntrs_base(hw);

        er32(PRC64);
        er32(PRC127);
        er32(PRC255);
        er32(PRC511);
        er32(PRC1023);
        er32(PRC1522);
        er32(PTC64);
        er32(PTC127);
        er32(PTC255);
        er32(PTC511);
        er32(PTC1023);
        er32(PTC1522);

        er32(ALGNERRC);
        er32(RXERRC);
        er32(TNCRS);
        er32(CEXTERR);
        er32(TSCTC);
        er32(TSCTFC);

        er32(MGTPRC);
        er32(MGTPDC);
        er32(MGTPTC);

        er32(IAC);
        er32(ICRXOC);

        er32(ICRXPTC);
        er32(ICRXATC);
        er32(ICTXPTC);
        er32(ICTXATC);
        er32(ICTXQEC);
        er32(ICTXQMTC);
        er32(ICRXDMTC);
}

static const struct e1000_mac_operations e82571_mac_ops = {
        /* .check_mng_mode: mac type dependent */
        /* .check_for_link: media type dependent */
        .id_led_init            = e1000e_id_led_init_generic,
        .cleanup_led            = e1000e_cleanup_led_generic,
        .clear_hw_cntrs         = e1000_clear_hw_cntrs_82571,
        .get_bus_info           = e1000e_get_bus_info_pcie,
        .set_lan_id             = e1000_set_lan_id_multi_port_pcie,
        /* .get_link_up_info: media type dependent */
        /* .led_on: mac type dependent */
        .led_off                = e1000e_led_off_generic,
        .update_mc_addr_list    = e1000e_update_mc_addr_list_generic,
        .write_vfta             = e1000_write_vfta_generic,
        .clear_vfta             = e1000_clear_vfta_82571,
        .reset_hw               = e1000_reset_hw_82571,
        .init_hw                = e1000_init_hw_82571,
        .setup_link             = e1000_setup_link_82571,
        /* .setup_physical_interface: media type dependent */
        .setup_led              = e1000e_setup_led_generic,
        .config_collision_dist  = e1000e_config_collision_dist_generic,
        .read_mac_addr          = e1000_read_mac_addr_82571,
        .rar_set                = e1000e_rar_set_generic,
        .rar_get_count          = e1000e_rar_get_count_generic,
};

static const struct e1000_phy_operations e82_phy_ops_igp = {
        .acquire                = e1000_get_hw_semaphore_82571,
        .check_polarity         = e1000_check_polarity_igp,
        .check_reset_block      = e1000e_check_reset_block_generic,
        .commit                 = NULL,
        .force_speed_duplex     = e1000e_phy_force_speed_duplex_igp,
        .get_cfg_done           = e1000_get_cfg_done_82571,
        .get_cable_length       = e1000e_get_cable_length_igp_2,
        .get_info               = e1000e_get_phy_info_igp,
        .read_reg               = e1000e_read_phy_reg_igp,
        .release                = e1000_put_hw_semaphore_82571,
        .reset                  = e1000e_phy_hw_reset_generic,
        .set_d0_lplu_state      = e1000_set_d0_lplu_state_82571,
        .set_d3_lplu_state      = e1000e_set_d3_lplu_state,
        .write_reg              = e1000e_write_phy_reg_igp,
        .cfg_on_link_up         = NULL,
};

static const struct e1000_phy_operations e82_phy_ops_m88 = {
        .acquire                = e1000_get_hw_semaphore_82571,
        .check_polarity         = e1000_check_polarity_m88,
        .check_reset_block      = e1000e_check_reset_block_generic,
        .commit                 = e1000e_phy_sw_reset,
        .force_speed_duplex     = e1000e_phy_force_speed_duplex_m88,
        .get_cfg_done           = e1000e_get_cfg_done_generic,
        .get_cable_length       = e1000e_get_cable_length_m88,
        .get_info               = e1000e_get_phy_info_m88,
        .read_reg               = e1000e_read_phy_reg_m88,
        .release                = e1000_put_hw_semaphore_82571,
        .reset                  = e1000e_phy_hw_reset_generic,
        .set_d0_lplu_state      = e1000_set_d0_lplu_state_82571,
        .set_d3_lplu_state      = e1000e_set_d3_lplu_state,
        .write_reg              = e1000e_write_phy_reg_m88,
        .cfg_on_link_up         = NULL,
};

static const struct e1000_phy_operations e82_phy_ops_bm = {
        .acquire                = e1000_get_hw_semaphore_82571,
        .check_polarity         = e1000_check_polarity_m88,
        .check_reset_block      = e1000e_check_reset_block_generic,
        .commit                 = e1000e_phy_sw_reset,
        .force_speed_duplex     = e1000e_phy_force_speed_duplex_m88,
        .get_cfg_done           = e1000e_get_cfg_done_generic,
        .get_cable_length       = e1000e_get_cable_length_m88,
        .get_info               = e1000e_get_phy_info_m88,
        .read_reg               = e1000e_read_phy_reg_bm2,
        .release                = e1000_put_hw_semaphore_82571,
        .reset                  = e1000e_phy_hw_reset_generic,
        .set_d0_lplu_state      = e1000_set_d0_lplu_state_82571,
        .set_d3_lplu_state      = e1000e_set_d3_lplu_state,
        .write_reg              = e1000e_write_phy_reg_bm2,
        .cfg_on_link_up         = NULL,
};

static const struct e1000_nvm_operations e82571_nvm_ops = {
        .acquire                = e1000_acquire_nvm_82571,
        .read                   = e1000e_read_nvm_eerd,
        .release                = e1000_release_nvm_82571,
        .reload                 = e1000e_reload_nvm_generic,
        .update                 = e1000_update_nvm_checksum_82571,
        .valid_led_default      = e1000_valid_led_default_82571,
        .validate               = e1000_validate_nvm_checksum_82571,
        .write                  = e1000_write_nvm_82571,
};

const struct e1000_info e1000_82571_info = {
        .mac                    = e1000_82571,
        .flags                  = FLAG_HAS_HW_VLAN_FILTER
                                  | FLAG_HAS_JUMBO_FRAMES
                                  | FLAG_HAS_WOL
                                  | FLAG_APME_IN_CTRL3
                                  | FLAG_HAS_CTRLEXT_ON_LOAD
                                  | FLAG_HAS_SMART_POWER_DOWN
                                  | FLAG_RESET_OVERWRITES_LAA /* errata */
                                  | FLAG_TARC_SPEED_MODE_BIT /* errata */
                                  | FLAG_APME_CHECK_PORT_B,
        .flags2                 = FLAG2_DISABLE_ASPM_L1 /* errata 13 */
                                  | FLAG2_DMA_BURST,
        .pba                    = 38,
        .max_hw_frame_size      = DEFAULT_JUMBO,
        .get_variants           = e1000_get_variants_82571,
        .mac_ops                = &e82571_mac_ops,
        .phy_ops                = &e82_phy_ops_igp,
        .nvm_ops                = &e82571_nvm_ops,
};

const struct e1000_info e1000_82572_info = {
        .mac                    = e1000_82572,
        .flags                  = FLAG_HAS_HW_VLAN_FILTER
                                  | FLAG_HAS_JUMBO_FRAMES
                                  | FLAG_HAS_WOL
                                  | FLAG_APME_IN_CTRL3
                                  | FLAG_HAS_CTRLEXT_ON_LOAD
                                  | FLAG_TARC_SPEED_MODE_BIT, /* errata */
        .flags2                 = FLAG2_DISABLE_ASPM_L1 /* errata 13 */
                                  | FLAG2_DMA_BURST,
        .pba                    = 38,
        .max_hw_frame_size      = DEFAULT_JUMBO,
        .get_variants           = e1000_get_variants_82571,
        .mac_ops                = &e82571_mac_ops,
        .phy_ops                = &e82_phy_ops_igp,
        .nvm_ops                = &e82571_nvm_ops,
};

const struct e1000_info e1000_82573_info = {
        .mac                    = e1000_82573,
        .flags                  = FLAG_HAS_HW_VLAN_FILTER
                                  | FLAG_HAS_WOL
                                  | FLAG_APME_IN_CTRL3
                                  | FLAG_HAS_SMART_POWER_DOWN
                                  | FLAG_HAS_AMT
                                  | FLAG_HAS_SWSM_ON_LOAD,
        .flags2                 = FLAG2_DISABLE_ASPM_L1
                                  | FLAG2_DISABLE_ASPM_L0S,
        .pba                    = 20,
        .max_hw_frame_size      = VLAN_ETH_FRAME_LEN + ETH_FCS_LEN,
        .get_variants           = e1000_get_variants_82571,
        .mac_ops                = &e82571_mac_ops,
        .phy_ops                = &e82_phy_ops_m88,
        .nvm_ops                = &e82571_nvm_ops,
};

const struct e1000_info e1000_82574_info = {
        .mac                    = e1000_82574,
        .flags                  = FLAG_HAS_HW_VLAN_FILTER
                                  | FLAG_HAS_MSIX
                                  | FLAG_HAS_JUMBO_FRAMES
                                  | FLAG_HAS_WOL
                                  | FLAG_HAS_HW_TIMESTAMP
                                  | FLAG_APME_IN_CTRL3
                                  | FLAG_HAS_SMART_POWER_DOWN
                                  | FLAG_HAS_AMT
                                  | FLAG_HAS_CTRLEXT_ON_LOAD,
        .flags2                  = FLAG2_CHECK_PHY_HANG
                                  | FLAG2_DISABLE_ASPM_L0S
                                  | FLAG2_DISABLE_ASPM_L1
                                  | FLAG2_NO_DISABLE_RX
                                  | FLAG2_DMA_BURST
                                  | FLAG2_CHECK_SYSTIM_OVERFLOW,
        .pba                    = 32,
        .max_hw_frame_size      = DEFAULT_JUMBO,
        .get_variants           = e1000_get_variants_82571,
        .mac_ops                = &e82571_mac_ops,
        .phy_ops                = &e82_phy_ops_bm,
        .nvm_ops                = &e82571_nvm_ops,
};

const struct e1000_info e1000_82583_info = {
        .mac                    = e1000_82583,
        .flags                  = FLAG_HAS_HW_VLAN_FILTER
                                  | FLAG_HAS_WOL
                                  | FLAG_HAS_HW_TIMESTAMP
                                  | FLAG_APME_IN_CTRL3
                                  | FLAG_HAS_SMART_POWER_DOWN
                                  | FLAG_HAS_AMT
                                  | FLAG_HAS_JUMBO_FRAMES
                                  | FLAG_HAS_CTRLEXT_ON_LOAD,
        .flags2                 = FLAG2_DISABLE_ASPM_L0S
                                  | FLAG2_DISABLE_ASPM_L1
                                  | FLAG2_NO_DISABLE_RX
                                  | FLAG2_CHECK_SYSTIM_OVERFLOW,
        .pba                    = 32,
        .max_hw_frame_size      = DEFAULT_JUMBO,
        .get_variants           = e1000_get_variants_82571,
        .mac_ops                = &e82571_mac_ops,
        .phy_ops                = &e82_phy_ops_bm,
        .nvm_ops                = &e82571_nvm_ops,
};