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

#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/sched.h>

#include "ixgbe.h"
#include "ixgbe_phy.h"

#define IXGBE_82598_MAX_TX_QUEUES 32
#define IXGBE_82598_MAX_RX_QUEUES 64
#define IXGBE_82598_RAR_ENTRIES   16
#define IXGBE_82598_MC_TBL_SIZE  128
#define IXGBE_82598_VFT_TBL_SIZE 128
#define IXGBE_82598_RX_PB_SIZE   512

static s32 ixgbe_setup_copper_link_82598(struct ixgbe_hw *hw,
                                         ixgbe_link_speed speed,
                                         bool autoneg_wait_to_complete);
static s32 ixgbe_read_i2c_eeprom_82598(struct ixgbe_hw *hw, u8 byte_offset,
                                       u8 *eeprom_data);

/**
 *  ixgbe_set_pcie_completion_timeout - set pci-e completion timeout
 *  @hw: pointer to the HW structure
 *
 *  The defaults for 82598 should be in the range of 50us to 50ms,
 *  however the hardware default for these parts is 500us to 1ms which is less
 *  than the 10ms recommended by the pci-e spec.  To address this we need to
 *  increase the value to either 10ms to 250ms for capability version 1 config,
 *  or 16ms to 55ms for version 2.
 **/
static void ixgbe_set_pcie_completion_timeout(struct ixgbe_hw *hw)
{
        u32 gcr = IXGBE_READ_REG(hw, IXGBE_GCR);
        u16 pcie_devctl2;

        if (ixgbe_removed(hw->hw_addr))
                return;

        /* only take action if timeout value is defaulted to 0 */
        if (gcr & IXGBE_GCR_CMPL_TMOUT_MASK)
                goto out;

        /*
         * if capababilities version is type 1 we can write the
         * timeout of 10ms to 250ms through the GCR register
         */
        if (!(gcr & IXGBE_GCR_CAP_VER2)) {
                gcr |= IXGBE_GCR_CMPL_TMOUT_10ms;
                goto out;
        }

        /*
         * for version 2 capabilities we need to write the config space
         * directly in order to set the completion timeout value for
         * 16ms to 55ms
         */
        pcie_devctl2 = ixgbe_read_pci_cfg_word(hw, IXGBE_PCI_DEVICE_CONTROL2);
        pcie_devctl2 |= IXGBE_PCI_DEVICE_CONTROL2_16ms;
        ixgbe_write_pci_cfg_word(hw, IXGBE_PCI_DEVICE_CONTROL2, pcie_devctl2);
out:
        /* disable completion timeout resend */
        gcr &= ~IXGBE_GCR_CMPL_TMOUT_RESEND;
        IXGBE_WRITE_REG(hw, IXGBE_GCR, gcr);
}

static s32 ixgbe_get_invariants_82598(struct ixgbe_hw *hw)
{
        struct ixgbe_mac_info *mac = &hw->mac;

        /* Call PHY identify routine to get the phy type */
        ixgbe_identify_phy_generic(hw);

        mac->mcft_size = IXGBE_82598_MC_TBL_SIZE;
        mac->vft_size = IXGBE_82598_VFT_TBL_SIZE;
        mac->num_rar_entries = IXGBE_82598_RAR_ENTRIES;
        mac->rx_pb_size = IXGBE_82598_RX_PB_SIZE;
        mac->max_rx_queues = IXGBE_82598_MAX_RX_QUEUES;
        mac->max_tx_queues = IXGBE_82598_MAX_TX_QUEUES;
        mac->max_msix_vectors = ixgbe_get_pcie_msix_count_generic(hw);

        return 0;
}

/**
 *  ixgbe_init_phy_ops_82598 - PHY/SFP specific init
 *  @hw: pointer to hardware structure
 *
 *  Initialize any function pointers that were not able to be
 *  set during get_invariants because the PHY/SFP type was
 *  not known.  Perform the SFP init if necessary.
 *
 **/
static s32 ixgbe_init_phy_ops_82598(struct ixgbe_hw *hw)
{
        struct ixgbe_mac_info *mac = &hw->mac;
        struct ixgbe_phy_info *phy = &hw->phy;
        s32 ret_val;
        u16 list_offset, data_offset;

        /* Identify the PHY */
        phy->ops.identify(hw);

        /* Overwrite the link function pointers if copper PHY */
        if (mac->ops.get_media_type(hw) == ixgbe_media_type_copper) {
                mac->ops.setup_link = &ixgbe_setup_copper_link_82598;
                mac->ops.get_link_capabilities =
                        &ixgbe_get_copper_link_capabilities_generic;
        }

        switch (hw->phy.type) {
        case ixgbe_phy_tn:
                phy->ops.setup_link = &ixgbe_setup_phy_link_tnx;
                phy->ops.check_link = &ixgbe_check_phy_link_tnx;
                break;
        case ixgbe_phy_nl:
                phy->ops.reset = &ixgbe_reset_phy_nl;

                /* Call SFP+ identify routine to get the SFP+ module type */
                ret_val = phy->ops.identify_sfp(hw);
                if (ret_val)
                        return ret_val;
                if (hw->phy.sfp_type == ixgbe_sfp_type_unknown)
                        return IXGBE_ERR_SFP_NOT_SUPPORTED;

                /* Check to see if SFP+ module is supported */
                ret_val = ixgbe_get_sfp_init_sequence_offsets(hw,
                                                            &list_offset,
                                                            &data_offset);
                if (ret_val)
                        return IXGBE_ERR_SFP_NOT_SUPPORTED;
                break;
        default:
                break;
        }

        return 0;
}

/**
 *  ixgbe_start_hw_82598 - Prepare hardware for Tx/Rx
 *  @hw: pointer to hardware structure
 *
 *  Starts the hardware using the generic start_hw function.
 *  Disables relaxed ordering for archs other than SPARC
 *  Then set pcie completion timeout
 *
 **/
static s32 ixgbe_start_hw_82598(struct ixgbe_hw *hw)
{
        s32 ret_val;

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

        /* set the completion timeout for interface */
        ixgbe_set_pcie_completion_timeout(hw);

        return 0;
}

/**
 *  ixgbe_get_link_capabilities_82598 - Determines link capabilities
 *  @hw: pointer to hardware structure
 *  @speed: pointer to link speed
 *  @autoneg: boolean auto-negotiation value
 *
 *  Determines the link capabilities by reading the AUTOC register.
 **/
static s32 ixgbe_get_link_capabilities_82598(struct ixgbe_hw *hw,
                                             ixgbe_link_speed *speed,
                                             bool *autoneg)
{
        u32 autoc = 0;

        /*
         * Determine link capabilities based on the stored value of AUTOC,
         * which represents EEPROM defaults.  If AUTOC value has not been
         * stored, use the current register value.
         */
        if (hw->mac.orig_link_settings_stored)
                autoc = hw->mac.orig_autoc;
        else
                autoc = IXGBE_READ_REG(hw, IXGBE_AUTOC);

        switch (autoc & IXGBE_AUTOC_LMS_MASK) {
        case IXGBE_AUTOC_LMS_1G_LINK_NO_AN:
                *speed = IXGBE_LINK_SPEED_1GB_FULL;
                *autoneg = false;
                break;

        case IXGBE_AUTOC_LMS_10G_LINK_NO_AN:
                *speed = IXGBE_LINK_SPEED_10GB_FULL;
                *autoneg = false;
                break;

        case IXGBE_AUTOC_LMS_1G_AN:
                *speed = IXGBE_LINK_SPEED_1GB_FULL;
                *autoneg = true;
                break;

        case IXGBE_AUTOC_LMS_KX4_AN:
        case IXGBE_AUTOC_LMS_KX4_AN_1G_AN:
                *speed = IXGBE_LINK_SPEED_UNKNOWN;
                if (autoc & IXGBE_AUTOC_KX4_SUPP)
                        *speed |= IXGBE_LINK_SPEED_10GB_FULL;
                if (autoc & IXGBE_AUTOC_KX_SUPP)
                        *speed |= IXGBE_LINK_SPEED_1GB_FULL;
                *autoneg = true;
                break;

        default:
                return IXGBE_ERR_LINK_SETUP;
        }

        return 0;
}

/**
 *  ixgbe_get_media_type_82598 - Determines media type
 *  @hw: pointer to hardware structure
 *
 *  Returns the media type (fiber, copper, backplane)
 **/
static enum ixgbe_media_type ixgbe_get_media_type_82598(struct ixgbe_hw *hw)
{
        /* Detect if there is a copper PHY attached. */
        switch (hw->phy.type) {
        case ixgbe_phy_cu_unknown:
        case ixgbe_phy_tn:
                return ixgbe_media_type_copper;

        default:
                break;
        }

        /* Media type for I82598 is based on device ID */
        switch (hw->device_id) {
        case IXGBE_DEV_ID_82598:
        case IXGBE_DEV_ID_82598_BX:
                /* Default device ID is mezzanine card KX/KX4 */
                return ixgbe_media_type_backplane;

        case IXGBE_DEV_ID_82598AF_DUAL_PORT:
        case IXGBE_DEV_ID_82598AF_SINGLE_PORT:
        case IXGBE_DEV_ID_82598_DA_DUAL_PORT:
        case IXGBE_DEV_ID_82598_SR_DUAL_PORT_EM:
        case IXGBE_DEV_ID_82598EB_XF_LR:
        case IXGBE_DEV_ID_82598EB_SFP_LOM:
                return ixgbe_media_type_fiber;

        case IXGBE_DEV_ID_82598EB_CX4:
        case IXGBE_DEV_ID_82598_CX4_DUAL_PORT:
                return ixgbe_media_type_cx4;

        case IXGBE_DEV_ID_82598AT:
        case IXGBE_DEV_ID_82598AT2:
                return ixgbe_media_type_copper;

        default:
                return ixgbe_media_type_unknown;
        }
}

/**
 *  ixgbe_fc_enable_82598 - Enable flow control
 *  @hw: pointer to hardware structure
 *
 *  Enable flow control according to the current settings.
 **/
static s32 ixgbe_fc_enable_82598(struct ixgbe_hw *hw)
{
        u32 fctrl_reg;
        u32 rmcs_reg;
        u32 reg;
        u32 fcrtl, fcrth;
        u32 link_speed = 0;
        int i;
        bool link_up;

        /* Validate the water mark configuration */
        if (!hw->fc.pause_time)
                return IXGBE_ERR_INVALID_LINK_SETTINGS;

        /* Low water mark of zero causes XOFF floods */
        for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
                if ((hw->fc.current_mode & ixgbe_fc_tx_pause) &&
                    hw->fc.high_water[i]) {
                        if (!hw->fc.low_water[i] ||
                            hw->fc.low_water[i] >= hw->fc.high_water[i]) {
                                hw_dbg(hw, "Invalid water mark configuration\n");
                                return IXGBE_ERR_INVALID_LINK_SETTINGS;
                        }
                }
        }

        /*
         * On 82598 having Rx FC on causes resets while doing 1G
         * so if it's on turn it off once we know link_speed. For
         * more details see 82598 Specification update.
         */
        hw->mac.ops.check_link(hw, &link_speed, &link_up, false);
        if (link_up && link_speed == IXGBE_LINK_SPEED_1GB_FULL) {
                switch (hw->fc.requested_mode) {
                case ixgbe_fc_full:
                        hw->fc.requested_mode = ixgbe_fc_tx_pause;
                        break;
                case ixgbe_fc_rx_pause:
                        hw->fc.requested_mode = ixgbe_fc_none;
                        break;
                default:
                        /* no change */
                        break;
                }
        }

        /* Negotiate the fc mode to use */
        hw->mac.ops.fc_autoneg(hw);

        /* Disable any previous flow control settings */
        fctrl_reg = IXGBE_READ_REG(hw, IXGBE_FCTRL);
        fctrl_reg &= ~(IXGBE_FCTRL_RFCE | IXGBE_FCTRL_RPFCE);

        rmcs_reg = IXGBE_READ_REG(hw, IXGBE_RMCS);
        rmcs_reg &= ~(IXGBE_RMCS_TFCE_PRIORITY | IXGBE_RMCS_TFCE_802_3X);

        /*
         * The possible values of fc.current_mode are:
         * 0: Flow control is completely disabled
         * 1: Rx flow control is enabled (we can receive pause frames,
         *    but not send pause frames).
         * 2: Tx flow control is enabled (we can send pause frames but
         *     we do not support receiving pause frames).
         * 3: Both Rx and Tx flow control (symmetric) are enabled.
         * other: Invalid.
         */
        switch (hw->fc.current_mode) {
        case ixgbe_fc_none:
                /*
                 * Flow control is disabled by software override or autoneg.
                 * The code below will actually disable it in the HW.
                 */
                break;
        case ixgbe_fc_rx_pause:
                /*
                 * Rx Flow control is enabled and Tx Flow control is
                 * disabled by software override. Since there really
                 * isn't a way to advertise that we are capable of RX
                 * Pause ONLY, we will advertise that we support both
                 * symmetric and asymmetric Rx PAUSE.  Later, we will
                 * disable the adapter's ability to send PAUSE frames.
                 */
                fctrl_reg |= IXGBE_FCTRL_RFCE;
                break;
        case ixgbe_fc_tx_pause:
                /*
                 * Tx Flow control is enabled, and Rx Flow control is
                 * disabled by software override.
                 */
                rmcs_reg |= IXGBE_RMCS_TFCE_802_3X;
                break;
        case ixgbe_fc_full:
                /* Flow control (both Rx and Tx) is enabled by SW override. */
                fctrl_reg |= IXGBE_FCTRL_RFCE;
                rmcs_reg |= IXGBE_RMCS_TFCE_802_3X;
                break;
        default:
                hw_dbg(hw, "Flow control param set incorrectly\n");
                return IXGBE_ERR_CONFIG;
        }

        /* Set 802.3x based flow control settings. */
        fctrl_reg |= IXGBE_FCTRL_DPF;
        IXGBE_WRITE_REG(hw, IXGBE_FCTRL, fctrl_reg);
        IXGBE_WRITE_REG(hw, IXGBE_RMCS, rmcs_reg);

        /* Set up and enable Rx high/low water mark thresholds, enable XON. */
        for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
                if ((hw->fc.current_mode & ixgbe_fc_tx_pause) &&
                    hw->fc.high_water[i]) {
                        fcrtl = (hw->fc.low_water[i] << 10) | IXGBE_FCRTL_XONE;
                        fcrth = (hw->fc.high_water[i] << 10) | IXGBE_FCRTH_FCEN;
                        IXGBE_WRITE_REG(hw, IXGBE_FCRTL(i), fcrtl);
                        IXGBE_WRITE_REG(hw, IXGBE_FCRTH(i), fcrth);
                } else {
                        IXGBE_WRITE_REG(hw, IXGBE_FCRTL(i), 0);
                        IXGBE_WRITE_REG(hw, IXGBE_FCRTH(i), 0);
                }

        }

        /* Configure pause time (2 TCs per register) */
        reg = hw->fc.pause_time * 0x00010001;
        for (i = 0; i < (MAX_TRAFFIC_CLASS / 2); i++)
                IXGBE_WRITE_REG(hw, IXGBE_FCTTV(i), reg);

        /* Configure flow control refresh threshold value */
        IXGBE_WRITE_REG(hw, IXGBE_FCRTV, hw->fc.pause_time / 2);

        return 0;
}

/**
 *  ixgbe_start_mac_link_82598 - Configures MAC link settings
 *  @hw: pointer to hardware structure
 *  @autoneg_wait_to_complete: true when waiting for completion is needed
 *
 *  Configures link settings based on values in the ixgbe_hw struct.
 *  Restarts the link.  Performs autonegotiation if needed.
 **/
static s32 ixgbe_start_mac_link_82598(struct ixgbe_hw *hw,
                                      bool autoneg_wait_to_complete)
{
        u32 autoc_reg;
        u32 links_reg;
        u32 i;
        s32 status = 0;

        /* Restart link */
        autoc_reg = IXGBE_READ_REG(hw, IXGBE_AUTOC);
        autoc_reg |= IXGBE_AUTOC_AN_RESTART;
        IXGBE_WRITE_REG(hw, IXGBE_AUTOC, autoc_reg);

        /* Only poll for autoneg to complete if specified to do so */
        if (autoneg_wait_to_complete) {
                if ((autoc_reg & IXGBE_AUTOC_LMS_MASK) ==
                     IXGBE_AUTOC_LMS_KX4_AN ||
                    (autoc_reg & IXGBE_AUTOC_LMS_MASK) ==
                     IXGBE_AUTOC_LMS_KX4_AN_1G_AN) {
                        links_reg = 0; /* Just in case Autoneg time = 0 */
                        for (i = 0; i < IXGBE_AUTO_NEG_TIME; i++) {
                                links_reg = IXGBE_READ_REG(hw, IXGBE_LINKS);
                                if (links_reg & IXGBE_LINKS_KX_AN_COMP)
                                        break;
                                msleep(100);
                        }
                        if (!(links_reg & IXGBE_LINKS_KX_AN_COMP)) {
                                status = IXGBE_ERR_AUTONEG_NOT_COMPLETE;
                                hw_dbg(hw, "Autonegotiation did not complete.\n");
                        }
                }
        }

        /* Add delay to filter out noises during initial link setup */
        msleep(50);

        return status;
}

/**
 *  ixgbe_validate_link_ready - Function looks for phy link
 *  @hw: pointer to hardware structure
 *
 *  Function indicates success when phy link is available. If phy is not ready
 *  within 5 seconds of MAC indicating link, the function returns error.
 **/
static s32 ixgbe_validate_link_ready(struct ixgbe_hw *hw)
{
        u32 timeout;
        u16 an_reg;

        if (hw->device_id != IXGBE_DEV_ID_82598AT2)
                return 0;

        for (timeout = 0;
             timeout < IXGBE_VALIDATE_LINK_READY_TIMEOUT; timeout++) {
                hw->phy.ops.read_reg(hw, MDIO_STAT1, MDIO_MMD_AN, &an_reg);

                if ((an_reg & MDIO_AN_STAT1_COMPLETE) &&
                    (an_reg & MDIO_STAT1_LSTATUS))
                        break;

                msleep(100);
        }

        if (timeout == IXGBE_VALIDATE_LINK_READY_TIMEOUT) {
                hw_dbg(hw, "Link was indicated but link is down\n");
                return IXGBE_ERR_LINK_SETUP;
        }

        return 0;
}

/**
 *  ixgbe_check_mac_link_82598 - Get link/speed status
 *  @hw: pointer to hardware structure
 *  @speed: pointer to link speed
 *  @link_up: true is link is up, false otherwise
 *  @link_up_wait_to_complete: bool used to wait for link up or not
 *
 *  Reads the links register to determine if link is up and the current speed
 **/
static s32 ixgbe_check_mac_link_82598(struct ixgbe_hw *hw,
                                      ixgbe_link_speed *speed, bool *link_up,
                                      bool link_up_wait_to_complete)
{
        u32 links_reg;
        u32 i;
        u16 link_reg, adapt_comp_reg;

        /*
         * SERDES PHY requires us to read link status from register 0xC79F.
         * Bit 0 set indicates link is up/ready; clear indicates link down.
         * 0xC00C is read to check that the XAUI lanes are active.  Bit 0
         * clear indicates active; set indicates inactive.
         */
        if (hw->phy.type == ixgbe_phy_nl) {
                hw->phy.ops.read_reg(hw, 0xC79F, MDIO_MMD_PMAPMD, &link_reg);
                hw->phy.ops.read_reg(hw, 0xC79F, MDIO_MMD_PMAPMD, &link_reg);
                hw->phy.ops.read_reg(hw, 0xC00C, MDIO_MMD_PMAPMD,
                                     &adapt_comp_reg);
                if (link_up_wait_to_complete) {
                        for (i = 0; i < IXGBE_LINK_UP_TIME; i++) {
                                if ((link_reg & 1) &&
                                    ((adapt_comp_reg & 1) == 0)) {
                                        *link_up = true;
                                        break;
                                } else {
                                        *link_up = false;
                                }
                                msleep(100);
                                hw->phy.ops.read_reg(hw, 0xC79F,
                                                     MDIO_MMD_PMAPMD,
                                                     &link_reg);
                                hw->phy.ops.read_reg(hw, 0xC00C,
                                                     MDIO_MMD_PMAPMD,
                                                     &adapt_comp_reg);
                        }
                } else {
                        if ((link_reg & 1) && ((adapt_comp_reg & 1) == 0))
                                *link_up = true;
                        else
                                *link_up = false;
                }

                if (!*link_up)
                        return 0;
        }

        links_reg = IXGBE_READ_REG(hw, IXGBE_LINKS);
        if (link_up_wait_to_complete) {
                for (i = 0; i < IXGBE_LINK_UP_TIME; i++) {
                        if (links_reg & IXGBE_LINKS_UP) {
                                *link_up = true;
                                break;
                        } else {
                                *link_up = false;
                        }
                        msleep(100);
                        links_reg = IXGBE_READ_REG(hw, IXGBE_LINKS);
                }
        } else {
                if (links_reg & IXGBE_LINKS_UP)
                        *link_up = true;
                else
                        *link_up = false;
        }

        if (links_reg & IXGBE_LINKS_SPEED)
                *speed = IXGBE_LINK_SPEED_10GB_FULL;
        else
                *speed = IXGBE_LINK_SPEED_1GB_FULL;

        if ((hw->device_id == IXGBE_DEV_ID_82598AT2) && *link_up &&
            (ixgbe_validate_link_ready(hw) != 0))
                *link_up = false;

        return 0;
}

/**
 *  ixgbe_setup_mac_link_82598 - Set MAC link speed
 *  @hw: pointer to hardware structure
 *  @speed: new link speed
 *  @autoneg_wait_to_complete: true when waiting for completion is needed
 *
 *  Set the link speed in the AUTOC register and restarts link.
 **/
static s32 ixgbe_setup_mac_link_82598(struct ixgbe_hw *hw,
                                      ixgbe_link_speed speed,
                                      bool autoneg_wait_to_complete)
{
        bool             autoneg           = false;
        ixgbe_link_speed link_capabilities = IXGBE_LINK_SPEED_UNKNOWN;
        u32              curr_autoc        = IXGBE_READ_REG(hw, IXGBE_AUTOC);
        u32              autoc             = curr_autoc;
        u32              link_mode         = autoc & IXGBE_AUTOC_LMS_MASK;

        /* Check to see if speed passed in is supported. */
        ixgbe_get_link_capabilities_82598(hw, &link_capabilities, &autoneg);
        speed &= link_capabilities;

        if (speed == IXGBE_LINK_SPEED_UNKNOWN)
                return IXGBE_ERR_LINK_SETUP;

        /* Set KX4/KX support according to speed requested */
        else if (link_mode == IXGBE_AUTOC_LMS_KX4_AN ||
                 link_mode == IXGBE_AUTOC_LMS_KX4_AN_1G_AN) {
                autoc &= ~IXGBE_AUTOC_KX4_KX_SUPP_MASK;
                if (speed & IXGBE_LINK_SPEED_10GB_FULL)
                        autoc |= IXGBE_AUTOC_KX4_SUPP;
                if (speed & IXGBE_LINK_SPEED_1GB_FULL)
                        autoc |= IXGBE_AUTOC_KX_SUPP;
                if (autoc != curr_autoc)
                        IXGBE_WRITE_REG(hw, IXGBE_AUTOC, autoc);
        }

        /* Setup and restart the link based on the new values in
         * ixgbe_hw This will write the AUTOC register based on the new
         * stored values
         */
        return ixgbe_start_mac_link_82598(hw, autoneg_wait_to_complete);
}


/**
 *  ixgbe_setup_copper_link_82598 - Set the PHY autoneg advertised field
 *  @hw: pointer to hardware structure
 *  @speed: new link speed
 *  @autoneg_wait_to_complete: true if waiting is needed to complete
 *
 *  Sets the link speed in the AUTOC register in the MAC and restarts link.
 **/
static s32 ixgbe_setup_copper_link_82598(struct ixgbe_hw *hw,
                                               ixgbe_link_speed speed,
                                               bool autoneg_wait_to_complete)
{
        s32 status;

        /* Setup the PHY according to input speed */
        status = hw->phy.ops.setup_link_speed(hw, speed,
                                              autoneg_wait_to_complete);
        /* Set up MAC */
        ixgbe_start_mac_link_82598(hw, autoneg_wait_to_complete);

        return status;
}

/**
 *  ixgbe_reset_hw_82598 - Performs hardware reset
 *  @hw: pointer to hardware structure
 *
 *  Resets the hardware by resetting the transmit and receive units, masks and
 *  clears all interrupts, performing a PHY reset, and performing a link (MAC)
 *  reset.
 **/
static s32 ixgbe_reset_hw_82598(struct ixgbe_hw *hw)
{
        s32 status;
        s32 phy_status = 0;
        u32 ctrl;
        u32 gheccr;
        u32 i;
        u32 autoc;
        u8  analog_val;

        /* Call adapter stop to disable tx/rx and clear interrupts */
        status = hw->mac.ops.stop_adapter(hw);
        if (status)
                return status;

        /*
         * Power up the Atlas Tx lanes if they are currently powered down.
         * Atlas Tx lanes are powered down for MAC loopback tests, but
         * they are not automatically restored on reset.
         */
        hw->mac.ops.read_analog_reg8(hw, IXGBE_ATLAS_PDN_LPBK, &analog_val);
        if (analog_val & IXGBE_ATLAS_PDN_TX_REG_EN) {
                /* Enable Tx Atlas so packets can be transmitted again */
                hw->mac.ops.read_analog_reg8(hw, IXGBE_ATLAS_PDN_LPBK,
                                             &analog_val);
                analog_val &= ~IXGBE_ATLAS_PDN_TX_REG_EN;
                hw->mac.ops.write_analog_reg8(hw, IXGBE_ATLAS_PDN_LPBK,
                                              analog_val);

                hw->mac.ops.read_analog_reg8(hw, IXGBE_ATLAS_PDN_10G,
                                             &analog_val);
                analog_val &= ~IXGBE_ATLAS_PDN_TX_10G_QL_ALL;
                hw->mac.ops.write_analog_reg8(hw, IXGBE_ATLAS_PDN_10G,
                                              analog_val);

                hw->mac.ops.read_analog_reg8(hw, IXGBE_ATLAS_PDN_1G,
                                             &analog_val);
                analog_val &= ~IXGBE_ATLAS_PDN_TX_1G_QL_ALL;
                hw->mac.ops.write_analog_reg8(hw, IXGBE_ATLAS_PDN_1G,
                                              analog_val);

                hw->mac.ops.read_analog_reg8(hw, IXGBE_ATLAS_PDN_AN,
                                             &analog_val);
                analog_val &= ~IXGBE_ATLAS_PDN_TX_AN_QL_ALL;
                hw->mac.ops.write_analog_reg8(hw, IXGBE_ATLAS_PDN_AN,
                                              analog_val);
        }

        /* Reset PHY */
        if (hw->phy.reset_disable == false) {
                /* PHY ops must be identified and initialized prior to reset */

                /* Init PHY and function pointers, perform SFP setup */
                phy_status = hw->phy.ops.init(hw);
                if (phy_status == IXGBE_ERR_SFP_NOT_SUPPORTED)
                        return phy_status;
                if (phy_status == IXGBE_ERR_SFP_NOT_PRESENT)
                        goto mac_reset_top;

                hw->phy.ops.reset(hw);
        }

mac_reset_top:
        /*
         * Issue global reset to the MAC.  This needs to be a SW reset.
         * If link reset is used, it might reset the MAC when mng is using it
         */
        ctrl = IXGBE_READ_REG(hw, IXGBE_CTRL) | IXGBE_CTRL_RST;
        IXGBE_WRITE_REG(hw, IXGBE_CTRL, ctrl);
        IXGBE_WRITE_FLUSH(hw);
        usleep_range(1000, 1200);

        /* Poll for reset bit to self-clear indicating reset is complete */
        for (i = 0; i < 10; i++) {
                ctrl = IXGBE_READ_REG(hw, IXGBE_CTRL);
                if (!(ctrl & IXGBE_CTRL_RST))
                        break;
                udelay(1);
        }
        if (ctrl & IXGBE_CTRL_RST) {
                status = IXGBE_ERR_RESET_FAILED;
                hw_dbg(hw, "Reset polling failed to complete.\n");
        }

        msleep(50);

        /*
         * Double resets are required for recovery from certain error
         * conditions.  Between resets, it is necessary to stall to allow time
         * for any pending HW events to complete.
         */
        if (hw->mac.flags & IXGBE_FLAGS_DOUBLE_RESET_REQUIRED) {
                hw->mac.flags &= ~IXGBE_FLAGS_DOUBLE_RESET_REQUIRED;
                goto mac_reset_top;
        }

        gheccr = IXGBE_READ_REG(hw, IXGBE_GHECCR);
        gheccr &= ~(BIT(21) | BIT(18) | BIT(9) | BIT(6));
        IXGBE_WRITE_REG(hw, IXGBE_GHECCR, gheccr);

        /*
         * Store the original AUTOC value if it has not been
         * stored off yet.  Otherwise restore the stored original
         * AUTOC value since the reset operation sets back to deaults.
         */
        autoc = IXGBE_READ_REG(hw, IXGBE_AUTOC);
        if (hw->mac.orig_link_settings_stored == false) {
                hw->mac.orig_autoc = autoc;
                hw->mac.orig_link_settings_stored = true;
        } else if (autoc != hw->mac.orig_autoc) {
                IXGBE_WRITE_REG(hw, IXGBE_AUTOC, hw->mac.orig_autoc);
        }

        /* Store the permanent mac address */
        hw->mac.ops.get_mac_addr(hw, hw->mac.perm_addr);

        /*
         * Store MAC address from RAR0, clear receive address registers, and
         * clear the multicast table
         */
        hw->mac.ops.init_rx_addrs(hw);

        if (phy_status)
                status = phy_status;

        return status;
}

/**
 *  ixgbe_set_vmdq_82598 - Associate a VMDq set index with a rx address
 *  @hw: pointer to hardware struct
 *  @rar: receive address register index to associate with a VMDq index
 *  @vmdq: VMDq set index
 **/
static s32 ixgbe_set_vmdq_82598(struct ixgbe_hw *hw, u32 rar, u32 vmdq)
{
        u32 rar_high;
        u32 rar_entries = hw->mac.num_rar_entries;

        /* Make sure we are using a valid rar index range */
        if (rar >= rar_entries) {
                hw_dbg(hw, "RAR index %d is out of range.\n", rar);
                return IXGBE_ERR_INVALID_ARGUMENT;
        }

        rar_high = IXGBE_READ_REG(hw, IXGBE_RAH(rar));
        rar_high &= ~IXGBE_RAH_VIND_MASK;
        rar_high |= ((vmdq << IXGBE_RAH_VIND_SHIFT) & IXGBE_RAH_VIND_MASK);
        IXGBE_WRITE_REG(hw, IXGBE_RAH(rar), rar_high);
        return 0;
}

/**
 *  ixgbe_clear_vmdq_82598 - Disassociate a VMDq set index from an rx address
 *  @hw: pointer to hardware struct
 *  @rar: receive address register index to associate with a VMDq index
 *  @vmdq: VMDq clear index (not used in 82598, but elsewhere)
 **/
static s32 ixgbe_clear_vmdq_82598(struct ixgbe_hw *hw, u32 rar, u32 vmdq)
{
        u32 rar_high;
        u32 rar_entries = hw->mac.num_rar_entries;


        /* Make sure we are using a valid rar index range */
        if (rar >= rar_entries) {
                hw_dbg(hw, "RAR index %d is out of range.\n", rar);
                return IXGBE_ERR_INVALID_ARGUMENT;
        }

        rar_high = IXGBE_READ_REG(hw, IXGBE_RAH(rar));
        if (rar_high & IXGBE_RAH_VIND_MASK) {
                rar_high &= ~IXGBE_RAH_VIND_MASK;
                IXGBE_WRITE_REG(hw, IXGBE_RAH(rar), rar_high);
        }

        return 0;
}

/**
 *  ixgbe_set_vfta_82598 - Set VLAN filter table
 *  @hw: pointer to hardware structure
 *  @vlan: VLAN id to write to VLAN filter
 *  @vind: VMDq output index that maps queue to VLAN id in VFTA
 *  @vlan_on: boolean flag to turn on/off VLAN in VFTA
 *  @vlvf_bypass: boolean flag - unused
 *
 *  Turn on/off specified VLAN in the VLAN filter table.
 **/
static s32 ixgbe_set_vfta_82598(struct ixgbe_hw *hw, u32 vlan, u32 vind,
                                bool vlan_on, bool vlvf_bypass)
{
        u32 regindex;
        u32 bitindex;
        u32 bits;
        u32 vftabyte;

        if (vlan > 4095)
                return IXGBE_ERR_PARAM;

        /* Determine 32-bit word position in array */
        regindex = (vlan >> 5) & 0x7F;   /* upper seven bits */

        /* Determine the location of the (VMD) queue index */
        vftabyte =  ((vlan >> 3) & 0x03); /* bits (4:3) indicating byte array */
        bitindex = (vlan & 0x7) << 2;    /* lower 3 bits indicate nibble */

        /* Set the nibble for VMD queue index */
        bits = IXGBE_READ_REG(hw, IXGBE_VFTAVIND(vftabyte, regindex));
        bits &= (~(0x0F << bitindex));
        bits |= (vind << bitindex);
        IXGBE_WRITE_REG(hw, IXGBE_VFTAVIND(vftabyte, regindex), bits);

        /* Determine the location of the bit for this VLAN id */
        bitindex = vlan & 0x1F;   /* lower five bits */

        bits = IXGBE_READ_REG(hw, IXGBE_VFTA(regindex));
        if (vlan_on)
                /* Turn on this VLAN id */
                bits |= BIT(bitindex);
        else
                /* Turn off this VLAN id */
                bits &= ~BIT(bitindex);
        IXGBE_WRITE_REG(hw, IXGBE_VFTA(regindex), bits);

        return 0;
}

/**
 *  ixgbe_clear_vfta_82598 - Clear VLAN filter table
 *  @hw: pointer to hardware structure
 *
 *  Clears the VLAN filer table, and the VMDq index associated with the filter
 **/
static s32 ixgbe_clear_vfta_82598(struct ixgbe_hw *hw)
{
        u32 offset;
        u32 vlanbyte;

        for (offset = 0; offset < hw->mac.vft_size; offset++)
                IXGBE_WRITE_REG(hw, IXGBE_VFTA(offset), 0);

        for (vlanbyte = 0; vlanbyte < 4; vlanbyte++)
                for (offset = 0; offset < hw->mac.vft_size; offset++)
                        IXGBE_WRITE_REG(hw, IXGBE_VFTAVIND(vlanbyte, offset),
                                        0);

        return 0;
}

/**
 *  ixgbe_read_analog_reg8_82598 - Reads 8 bit Atlas analog register
 *  @hw: pointer to hardware structure
 *  @reg: analog register to read
 *  @val: read value
 *
 *  Performs read operation to Atlas analog register specified.
 **/
static s32 ixgbe_read_analog_reg8_82598(struct ixgbe_hw *hw, u32 reg, u8 *val)
{
        u32  atlas_ctl;

        IXGBE_WRITE_REG(hw, IXGBE_ATLASCTL,
                        IXGBE_ATLASCTL_WRITE_CMD | (reg << 8));
        IXGBE_WRITE_FLUSH(hw);
        udelay(10);
        atlas_ctl = IXGBE_READ_REG(hw, IXGBE_ATLASCTL);
        *val = (u8)atlas_ctl;

        return 0;
}

/**
 *  ixgbe_write_analog_reg8_82598 - Writes 8 bit Atlas analog register
 *  @hw: pointer to hardware structure
 *  @reg: atlas register to write
 *  @val: value to write
 *
 *  Performs write operation to Atlas analog register specified.
 **/
static s32 ixgbe_write_analog_reg8_82598(struct ixgbe_hw *hw, u32 reg, u8 val)
{
        u32  atlas_ctl;

        atlas_ctl = (reg << 8) | val;
        IXGBE_WRITE_REG(hw, IXGBE_ATLASCTL, atlas_ctl);
        IXGBE_WRITE_FLUSH(hw);
        udelay(10);

        return 0;
}

/**
 *  ixgbe_read_i2c_phy_82598 - Reads 8 bit word over I2C interface.
 *  @hw: pointer to hardware structure
 *  @dev_addr: address to read from
 *  @byte_offset: byte offset to read from dev_addr
 *  @eeprom_data: value read
 *
 *  Performs 8 byte read operation to SFP module's data over I2C interface.
 **/
static s32 ixgbe_read_i2c_phy_82598(struct ixgbe_hw *hw, u8 dev_addr,
                                    u8 byte_offset, u8 *eeprom_data)
{
        s32 status = 0;
        u16 sfp_addr = 0;
        u16 sfp_data = 0;
        u16 sfp_stat = 0;
        u16 gssr;
        u32 i;

        if (IXGBE_READ_REG(hw, IXGBE_STATUS) & IXGBE_STATUS_LAN_ID_1)
                gssr = IXGBE_GSSR_PHY1_SM;
        else
                gssr = IXGBE_GSSR_PHY0_SM;

        if (hw->mac.ops.acquire_swfw_sync(hw, gssr) != 0)
                return IXGBE_ERR_SWFW_SYNC;

        if (hw->phy.type == ixgbe_phy_nl) {
                /*
                 * phy SDA/SCL registers are at addresses 0xC30A to
                 * 0xC30D.  These registers are used to talk to the SFP+
                 * module's EEPROM through the SDA/SCL (I2C) interface.
                 */
                sfp_addr = (dev_addr << 8) + byte_offset;
                sfp_addr = (sfp_addr | IXGBE_I2C_EEPROM_READ_MASK);
                hw->phy.ops.write_reg_mdi(hw,
                                          IXGBE_MDIO_PMA_PMD_SDA_SCL_ADDR,
                                          MDIO_MMD_PMAPMD,
                                          sfp_addr);

                /* Poll status */
                for (i = 0; i < 100; i++) {
                        hw->phy.ops.read_reg_mdi(hw,
                                                IXGBE_MDIO_PMA_PMD_SDA_SCL_STAT,
                                                MDIO_MMD_PMAPMD,
                                                &sfp_stat);
                        sfp_stat = sfp_stat & IXGBE_I2C_EEPROM_STATUS_MASK;
                        if (sfp_stat != IXGBE_I2C_EEPROM_STATUS_IN_PROGRESS)
                                break;
                        usleep_range(10000, 20000);
                }

                if (sfp_stat != IXGBE_I2C_EEPROM_STATUS_PASS) {
                        hw_dbg(hw, "EEPROM read did not pass.\n");
                        status = IXGBE_ERR_SFP_NOT_PRESENT;
                        goto out;
                }

                /* Read data */

                hw->phy.ops.read_reg_mdi(hw, IXGBE_MDIO_PMA_PMD_SDA_SCL_DATA,
                                        MDIO_MMD_PMAPMD, &sfp_data);

                *eeprom_data = (u8)(sfp_data >> 8);
        } else {
                status = IXGBE_ERR_PHY;
        }

out:
        hw->mac.ops.release_swfw_sync(hw, gssr);
        return status;
}

/**
 *  ixgbe_read_i2c_eeprom_82598 - Reads 8 bit word over I2C interface.
 *  @hw: pointer to hardware structure
 *  @byte_offset: EEPROM byte offset to read
 *  @eeprom_data: value read
 *
 *  Performs 8 byte read operation to SFP module's EEPROM over I2C interface.
 **/
static s32 ixgbe_read_i2c_eeprom_82598(struct ixgbe_hw *hw, u8 byte_offset,
                                       u8 *eeprom_data)
{
        return ixgbe_read_i2c_phy_82598(hw, IXGBE_I2C_EEPROM_DEV_ADDR,
                                        byte_offset, eeprom_data);
}

/**
 *  ixgbe_read_i2c_sff8472_82598 - Reads 8 bit word over I2C interface.
 *  @hw: pointer to hardware structure
 *  @byte_offset: byte offset at address 0xA2
 *  @sff8472_data: value read
 *
 *  Performs 8 byte read operation to SFP module's SFF-8472 data over I2C
 **/
static s32 ixgbe_read_i2c_sff8472_82598(struct ixgbe_hw *hw, u8 byte_offset,
                                       u8 *sff8472_data)
{
        return ixgbe_read_i2c_phy_82598(hw, IXGBE_I2C_EEPROM_DEV_ADDR2,
                                        byte_offset, sff8472_data);
}

/**
 *  ixgbe_set_lan_id_multi_port_pcie_82598 - Set LAN id for PCIe multiple
 *  port devices.
 *  @hw: pointer to the HW structure
 *
 *  Calls common function and corrects issue with some single port devices
 *  that enable LAN1 but not LAN0.
 **/
static void ixgbe_set_lan_id_multi_port_pcie_82598(struct ixgbe_hw *hw)
{
        struct ixgbe_bus_info *bus = &hw->bus;
        u16 pci_gen = 0;
        u16 pci_ctrl2 = 0;

        ixgbe_set_lan_id_multi_port_pcie(hw);

        /* check if LAN0 is disabled */
        hw->eeprom.ops.read(hw, IXGBE_PCIE_GENERAL_PTR, &pci_gen);
        if ((pci_gen != 0) && (pci_gen != 0xFFFF)) {

                hw->eeprom.ops.read(hw, pci_gen + IXGBE_PCIE_CTRL2, &pci_ctrl2);

                /* if LAN0 is completely disabled force function to 0 */
                if ((pci_ctrl2 & IXGBE_PCIE_CTRL2_LAN_DISABLE) &&
                    !(pci_ctrl2 & IXGBE_PCIE_CTRL2_DISABLE_SELECT) &&
                    !(pci_ctrl2 & IXGBE_PCIE_CTRL2_DUMMY_ENABLE)) {

                        bus->func = 0;
                }
        }
}

/**
 * ixgbe_set_rxpba_82598 - Initialize RX packet buffer
 * @hw: pointer to hardware structure
 * @num_pb: number of packet buffers to allocate
 * @headroom: reserve n KB of headroom
 * @strategy: packet buffer allocation strategy
 **/
static void ixgbe_set_rxpba_82598(struct ixgbe_hw *hw, int num_pb,
                                  u32 headroom, int strategy)
{
        u32 rxpktsize = IXGBE_RXPBSIZE_64KB;
        u8  i = 0;

        if (!num_pb)
                return;

        /* Setup Rx packet buffer sizes */
        switch (strategy) {
        case PBA_STRATEGY_WEIGHTED:
                /* Setup the first four at 80KB */
                rxpktsize = IXGBE_RXPBSIZE_80KB;
                for (; i < 4; i++)
                        IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), rxpktsize);
                /* Setup the last four at 48KB...don't re-init i */
                rxpktsize = IXGBE_RXPBSIZE_48KB;
                /* Fall Through */
        case PBA_STRATEGY_EQUAL:
        default:
                /* Divide the remaining Rx packet buffer evenly among the TCs */
                for (; i < IXGBE_MAX_PACKET_BUFFERS; i++)
                        IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), rxpktsize);
                break;
        }

        /* Setup Tx packet buffer sizes */
        for (i = 0; i < IXGBE_MAX_PACKET_BUFFERS; i++)
                IXGBE_WRITE_REG(hw, IXGBE_TXPBSIZE(i), IXGBE_TXPBSIZE_40KB);
}

static const struct ixgbe_mac_operations mac_ops_82598 = {
        .init_hw                = &ixgbe_init_hw_generic,
        .reset_hw               = &ixgbe_reset_hw_82598,
        .start_hw               = &ixgbe_start_hw_82598,
        .clear_hw_cntrs         = &ixgbe_clear_hw_cntrs_generic,
        .get_media_type         = &ixgbe_get_media_type_82598,
        .enable_rx_dma          = &ixgbe_enable_rx_dma_generic,
        .get_mac_addr           = &ixgbe_get_mac_addr_generic,
        .stop_adapter           = &ixgbe_stop_adapter_generic,
        .get_bus_info           = &ixgbe_get_bus_info_generic,
        .set_lan_id             = &ixgbe_set_lan_id_multi_port_pcie_82598,
        .read_analog_reg8       = &ixgbe_read_analog_reg8_82598,
        .write_analog_reg8      = &ixgbe_write_analog_reg8_82598,
        .setup_link             = &ixgbe_setup_mac_link_82598,
        .set_rxpba              = &ixgbe_set_rxpba_82598,
        .check_link             = &ixgbe_check_mac_link_82598,
        .get_link_capabilities  = &ixgbe_get_link_capabilities_82598,
        .led_on                 = &ixgbe_led_on_generic,
        .led_off                = &ixgbe_led_off_generic,
        .init_led_link_act      = ixgbe_init_led_link_act_generic,
        .blink_led_start        = &ixgbe_blink_led_start_generic,
        .blink_led_stop         = &ixgbe_blink_led_stop_generic,
        .set_rar                = &ixgbe_set_rar_generic,
        .clear_rar              = &ixgbe_clear_rar_generic,
        .set_vmdq               = &ixgbe_set_vmdq_82598,
        .clear_vmdq             = &ixgbe_clear_vmdq_82598,
        .init_rx_addrs          = &ixgbe_init_rx_addrs_generic,
        .update_mc_addr_list    = &ixgbe_update_mc_addr_list_generic,
        .enable_mc              = &ixgbe_enable_mc_generic,
        .disable_mc             = &ixgbe_disable_mc_generic,
        .clear_vfta             = &ixgbe_clear_vfta_82598,
        .set_vfta               = &ixgbe_set_vfta_82598,
        .fc_enable              = &ixgbe_fc_enable_82598,
        .setup_fc               = ixgbe_setup_fc_generic,
        .fc_autoneg             = ixgbe_fc_autoneg,
        .set_fw_drv_ver         = NULL,
        .acquire_swfw_sync      = &ixgbe_acquire_swfw_sync,
        .release_swfw_sync      = &ixgbe_release_swfw_sync,
        .init_swfw_sync         = NULL,
        .get_thermal_sensor_data = NULL,
        .init_thermal_sensor_thresh = NULL,
        .prot_autoc_read        = &prot_autoc_read_generic,
        .prot_autoc_write       = &prot_autoc_write_generic,
        .enable_rx              = &ixgbe_enable_rx_generic,
        .disable_rx             = &ixgbe_disable_rx_generic,
};

static const struct ixgbe_eeprom_operations eeprom_ops_82598 = {
        .init_params            = &ixgbe_init_eeprom_params_generic,
        .read                   = &ixgbe_read_eerd_generic,
        .write                  = &ixgbe_write_eeprom_generic,
        .write_buffer           = &ixgbe_write_eeprom_buffer_bit_bang_generic,
        .read_buffer            = &ixgbe_read_eerd_buffer_generic,
        .calc_checksum          = &ixgbe_calc_eeprom_checksum_generic,
        .validate_checksum      = &ixgbe_validate_eeprom_checksum_generic,
        .update_checksum        = &ixgbe_update_eeprom_checksum_generic,
};

static const struct ixgbe_phy_operations phy_ops_82598 = {
        .identify               = &ixgbe_identify_phy_generic,
        .identify_sfp           = &ixgbe_identify_module_generic,
        .init                   = &ixgbe_init_phy_ops_82598,
        .reset                  = &ixgbe_reset_phy_generic,
        .read_reg               = &ixgbe_read_phy_reg_generic,
        .write_reg              = &ixgbe_write_phy_reg_generic,
        .read_reg_mdi           = &ixgbe_read_phy_reg_mdi,
        .write_reg_mdi          = &ixgbe_write_phy_reg_mdi,
        .setup_link             = &ixgbe_setup_phy_link_generic,
        .setup_link_speed       = &ixgbe_setup_phy_link_speed_generic,
        .read_i2c_sff8472       = &ixgbe_read_i2c_sff8472_82598,
        .read_i2c_eeprom        = &ixgbe_read_i2c_eeprom_82598,
        .check_overtemp         = &ixgbe_tn_check_overtemp,
};

const struct ixgbe_info ixgbe_82598_info = {
        .mac                    = ixgbe_mac_82598EB,
        .get_invariants         = &ixgbe_get_invariants_82598,
        .mac_ops                = &mac_ops_82598,
        .eeprom_ops             = &eeprom_ops_82598,
        .phy_ops                = &phy_ops_82598,
        .mvals                  = ixgbe_mvals_8259X,
};