// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2007 - 2018 Intel Corporation. */

/* e1000_i210
 * e1000_i211
 */

#include <linux/types.h>
#include <linux/if_ether.h>

#include "e1000_hw.h"
#include "e1000_i210.h"

static s32 igb_update_flash_i210(struct e1000_hw *hw);

/**
 * igb_get_hw_semaphore_i210 - Acquire hardware semaphore
 *  @hw: pointer to the HW structure
 *
 *  Acquire the HW semaphore to access the PHY or NVM
 */
static s32 igb_get_hw_semaphore_i210(struct e1000_hw *hw)
{
        u32 swsm;
        s32 timeout = hw->nvm.word_size + 1;
        s32 i = 0;

        /* Get the SW semaphore */
        while (i < timeout) {
                swsm = rd32(E1000_SWSM);
                if (!(swsm & E1000_SWSM_SMBI))
                        break;

                udelay(50);
                i++;
        }

        if (i == timeout) {
                /* In rare circumstances, the SW semaphore may already be held
                 * unintentionally. Clear the semaphore once before giving up.
                 */
                if (hw->dev_spec._82575.clear_semaphore_once) {
                        hw->dev_spec._82575.clear_semaphore_once = false;
                        igb_put_hw_semaphore(hw);
                        for (i = 0; i < timeout; i++) {
                                swsm = rd32(E1000_SWSM);
                                if (!(swsm & E1000_SWSM_SMBI))
                                        break;

                                udelay(50);
                        }
                }

                /* If we do not have the semaphore here, we have to give up. */
                if (i == timeout) {
                        hw_dbg("Driver can't access device - SMBI bit is set.\n");
                        return -E1000_ERR_NVM;
                }
        }

        /* Get the FW semaphore. */
        for (i = 0; i < timeout; i++) {
                swsm = rd32(E1000_SWSM);
                wr32(E1000_SWSM, swsm | E1000_SWSM_SWESMBI);

                /* Semaphore acquired if bit latched */
                if (rd32(E1000_SWSM) & E1000_SWSM_SWESMBI)
                        break;

                udelay(50);
        }

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

        return 0;
}

/**
 *  igb_acquire_nvm_i210 - Request for access to EEPROM
 *  @hw: pointer to the HW structure
 *
 *  Acquire the necessary semaphores for exclusive access to the EEPROM.
 *  Set the EEPROM access request bit and wait for EEPROM access grant bit.
 *  Return successful if access grant bit set, else clear the request for
 *  EEPROM access and return -E1000_ERR_NVM (-1).
 **/
static s32 igb_acquire_nvm_i210(struct e1000_hw *hw)
{
        return igb_acquire_swfw_sync_i210(hw, E1000_SWFW_EEP_SM);
}

/**
 *  igb_release_nvm_i210 - Release exclusive access to EEPROM
 *  @hw: pointer to the HW structure
 *
 *  Stop any current commands to the EEPROM and clear the EEPROM request bit,
 *  then release the semaphores acquired.
 **/
static void igb_release_nvm_i210(struct e1000_hw *hw)
{
        igb_release_swfw_sync_i210(hw, E1000_SWFW_EEP_SM);
}

/**
 *  igb_acquire_swfw_sync_i210 - Acquire SW/FW semaphore
 *  @hw: pointer to the HW structure
 *  @mask: specifies which semaphore to acquire
 *
 *  Acquire the SW/FW semaphore to access the PHY or NVM.  The mask
 *  will also specify which port we're acquiring the lock for.
 **/
s32 igb_acquire_swfw_sync_i210(struct e1000_hw *hw, u16 mask)
{
        u32 swfw_sync;
        u32 swmask = mask;
        u32 fwmask = mask << 16;
        s32 ret_val = 0;
        s32 i = 0, timeout = 200; /* FIXME: find real value to use here */

        while (i < timeout) {
                if (igb_get_hw_semaphore_i210(hw)) {
                        ret_val = -E1000_ERR_SWFW_SYNC;
                        goto out;
                }

                swfw_sync = rd32(E1000_SW_FW_SYNC);
                if (!(swfw_sync & (fwmask | swmask)))
                        break;

                /* Firmware currently using resource (fwmask) */
                igb_put_hw_semaphore(hw);
                mdelay(5);
                i++;
        }

        if (i == timeout) {
                hw_dbg("Driver can't access resource, SW_FW_SYNC timeout.\n");
                ret_val = -E1000_ERR_SWFW_SYNC;
                goto out;
        }

        swfw_sync |= swmask;
        wr32(E1000_SW_FW_SYNC, swfw_sync);

        igb_put_hw_semaphore(hw);
out:
        return ret_val;
}

/**
 *  igb_release_swfw_sync_i210 - Release SW/FW semaphore
 *  @hw: pointer to the HW structure
 *  @mask: specifies which semaphore to acquire
 *
 *  Release the SW/FW semaphore used to access the PHY or NVM.  The mask
 *  will also specify which port we're releasing the lock for.
 **/
void igb_release_swfw_sync_i210(struct e1000_hw *hw, u16 mask)
{
        u32 swfw_sync;

        while (igb_get_hw_semaphore_i210(hw))
                ; /* Empty */

        swfw_sync = rd32(E1000_SW_FW_SYNC);
        swfw_sync &= ~mask;
        wr32(E1000_SW_FW_SYNC, swfw_sync);

        igb_put_hw_semaphore(hw);
}

/**
 *  igb_read_nvm_srrd_i210 - Reads Shadow Ram using EERD register
 *  @hw: pointer to the HW structure
 *  @offset: offset of word in the Shadow Ram to read
 *  @words: number of words to read
 *  @data: word read from the Shadow Ram
 *
 *  Reads a 16 bit word from the Shadow Ram using the EERD register.
 *  Uses necessary synchronization semaphores.
 **/
static s32 igb_read_nvm_srrd_i210(struct e1000_hw *hw, u16 offset, u16 words,
                                  u16 *data)
{
        s32 status = 0;
        u16 i, count;

        /* We cannot hold synchronization semaphores for too long,
         * because of forceful takeover procedure. However it is more efficient
         * to read in bursts than synchronizing access for each word.
         */
        for (i = 0; i < words; i += E1000_EERD_EEWR_MAX_COUNT) {
                count = (words - i) / E1000_EERD_EEWR_MAX_COUNT > 0 ?
                        E1000_EERD_EEWR_MAX_COUNT : (words - i);
                if (!(hw->nvm.ops.acquire(hw))) {
                        status = igb_read_nvm_eerd(hw, offset, count,
                                                     data + i);
                        hw->nvm.ops.release(hw);
                } else {
                        status = E1000_ERR_SWFW_SYNC;
                }

                if (status)
                        break;
        }

        return status;
}

/**
 *  igb_write_nvm_srwr - Write to Shadow Ram using EEWR
 *  @hw: pointer to the HW structure
 *  @offset: offset within the Shadow Ram to be written to
 *  @words: number of words to write
 *  @data: 16 bit word(s) to be written to the Shadow Ram
 *
 *  Writes data to Shadow Ram at offset using EEWR register.
 *
 *  If igb_update_nvm_checksum is not called after this function , the
 *  Shadow Ram will most likely contain an invalid checksum.
 **/
static s32 igb_write_nvm_srwr(struct e1000_hw *hw, u16 offset, u16 words,
                                u16 *data)
{
        struct e1000_nvm_info *nvm = &hw->nvm;
        u32 i, k, eewr = 0;
        u32 attempts = 100000;
        s32 ret_val = 0;

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

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

                wr32(E1000_SRWR, eewr);

                for (k = 0; k < attempts; k++) {
                        if (E1000_NVM_RW_REG_DONE &
                            rd32(E1000_SRWR)) {
                                ret_val = 0;
                                break;
                        }
                        udelay(5);
        }

                if (ret_val) {
                        hw_dbg("Shadow RAM write EEWR timed out\n");
                        break;
                }
        }

out:
        return ret_val;
}

/**
 *  igb_write_nvm_srwr_i210 - Write to Shadow RAM using EEWR
 *  @hw: pointer to the HW structure
 *  @offset: offset within the Shadow RAM to be written to
 *  @words: number of words to write
 *  @data: 16 bit word(s) to be written to the Shadow RAM
 *
 *  Writes data to Shadow RAM at offset using EEWR register.
 *
 *  If e1000_update_nvm_checksum is not called after this function , the
 *  data will not be committed to FLASH and also Shadow RAM will most likely
 *  contain an invalid checksum.
 *
 *  If error code is returned, data and Shadow RAM may be inconsistent - buffer
 *  partially written.
 **/
static s32 igb_write_nvm_srwr_i210(struct e1000_hw *hw, u16 offset, u16 words,
                                   u16 *data)
{
        s32 status = 0;
        u16 i, count;

        /* We cannot hold synchronization semaphores for too long,
         * because of forceful takeover procedure. However it is more efficient
         * to write in bursts than synchronizing access for each word.
         */
        for (i = 0; i < words; i += E1000_EERD_EEWR_MAX_COUNT) {
                count = (words - i) / E1000_EERD_EEWR_MAX_COUNT > 0 ?
                        E1000_EERD_EEWR_MAX_COUNT : (words - i);
                if (!(hw->nvm.ops.acquire(hw))) {
                        status = igb_write_nvm_srwr(hw, offset, count,
                                                      data + i);
                        hw->nvm.ops.release(hw);
                } else {
                        status = E1000_ERR_SWFW_SYNC;
                }

                if (status)
                        break;
        }

        return status;
}

/**
 *  igb_read_invm_word_i210 - Reads OTP
 *  @hw: pointer to the HW structure
 *  @address: the word address (aka eeprom offset) to read
 *  @data: pointer to the data read
 *
 *  Reads 16-bit words from the OTP. Return error when the word is not
 *  stored in OTP.
 **/
static s32 igb_read_invm_word_i210(struct e1000_hw *hw, u8 address, u16 *data)
{
        s32 status = -E1000_ERR_INVM_VALUE_NOT_FOUND;
        u32 invm_dword;
        u16 i;
        u8 record_type, word_address;

        for (i = 0; i < E1000_INVM_SIZE; i++) {
                invm_dword = rd32(E1000_INVM_DATA_REG(i));
                /* Get record type */
                record_type = INVM_DWORD_TO_RECORD_TYPE(invm_dword);
                if (record_type == E1000_INVM_UNINITIALIZED_STRUCTURE)
                        break;
                if (record_type == E1000_INVM_CSR_AUTOLOAD_STRUCTURE)
                        i += E1000_INVM_CSR_AUTOLOAD_DATA_SIZE_IN_DWORDS;
                if (record_type == E1000_INVM_RSA_KEY_SHA256_STRUCTURE)
                        i += E1000_INVM_RSA_KEY_SHA256_DATA_SIZE_IN_DWORDS;
                if (record_type == E1000_INVM_WORD_AUTOLOAD_STRUCTURE) {
                        word_address = INVM_DWORD_TO_WORD_ADDRESS(invm_dword);
                        if (word_address == address) {
                                *data = INVM_DWORD_TO_WORD_DATA(invm_dword);
                                hw_dbg("Read INVM Word 0x%02x = %x\n",
                                          address, *data);
                                status = 0;
                                break;
                        }
                }
        }
        if (status)
                hw_dbg("Requested word 0x%02x not found in OTP\n", address);
        return status;
}

/**
 * igb_read_invm_i210 - Read invm wrapper function for I210/I211
 *  @hw: pointer to the HW structure
 *  @words: number of words to read
 *  @data: pointer to the data read
 *
 *  Wrapper function to return data formerly found in the NVM.
 **/
static s32 igb_read_invm_i210(struct e1000_hw *hw, u16 offset,
                                u16 words __always_unused, u16 *data)
{
        s32 ret_val = 0;

        /* Only the MAC addr is required to be present in the iNVM */
        switch (offset) {
        case NVM_MAC_ADDR:
                ret_val = igb_read_invm_word_i210(hw, (u8)offset, &data[0]);
                ret_val |= igb_read_invm_word_i210(hw, (u8)offset+1,
                                                     &data[1]);
                ret_val |= igb_read_invm_word_i210(hw, (u8)offset+2,
                                                     &data[2]);
                if (ret_val)
                        hw_dbg("MAC Addr not found in iNVM\n");
                break;
        case NVM_INIT_CTRL_2:
                ret_val = igb_read_invm_word_i210(hw, (u8)offset, data);
                if (ret_val) {
                        *data = NVM_INIT_CTRL_2_DEFAULT_I211;
                        ret_val = 0;
                }
                break;
        case NVM_INIT_CTRL_4:
                ret_val = igb_read_invm_word_i210(hw, (u8)offset, data);
                if (ret_val) {
                        *data = NVM_INIT_CTRL_4_DEFAULT_I211;
                        ret_val = 0;
                }
                break;
        case NVM_LED_1_CFG:
                ret_val = igb_read_invm_word_i210(hw, (u8)offset, data);
                if (ret_val) {
                        *data = NVM_LED_1_CFG_DEFAULT_I211;
                        ret_val = 0;
                }
                break;
        case NVM_LED_0_2_CFG:
                ret_val = igb_read_invm_word_i210(hw, (u8)offset, data);
                if (ret_val) {
                        *data = NVM_LED_0_2_CFG_DEFAULT_I211;
                        ret_val = 0;
                }
                break;
        case NVM_ID_LED_SETTINGS:
                ret_val = igb_read_invm_word_i210(hw, (u8)offset, data);
                if (ret_val) {
                        *data = ID_LED_RESERVED_FFFF;
                        ret_val = 0;
                }
                break;
        case NVM_SUB_DEV_ID:
                *data = hw->subsystem_device_id;
                break;
        case NVM_SUB_VEN_ID:
                *data = hw->subsystem_vendor_id;
                break;
        case NVM_DEV_ID:
                *data = hw->device_id;
                break;
        case NVM_VEN_ID:
                *data = hw->vendor_id;
                break;
        default:
                hw_dbg("NVM word 0x%02x is not mapped.\n", offset);
                *data = NVM_RESERVED_WORD;
                break;
        }
        return ret_val;
}

/**
 *  igb_read_invm_version - Reads iNVM version and image type
 *  @hw: pointer to the HW structure
 *  @invm_ver: version structure for the version read
 *
 *  Reads iNVM version and image type.
 **/
s32 igb_read_invm_version(struct e1000_hw *hw,
                          struct e1000_fw_version *invm_ver) {
        u32 *record = NULL;
        u32 *next_record = NULL;
        u32 i = 0;
        u32 invm_dword = 0;
        u32 invm_blocks = E1000_INVM_SIZE - (E1000_INVM_ULT_BYTES_SIZE /
                                             E1000_INVM_RECORD_SIZE_IN_BYTES);
        u32 buffer[E1000_INVM_SIZE];
        s32 status = -E1000_ERR_INVM_VALUE_NOT_FOUND;
        u16 version = 0;

        /* Read iNVM memory */
        for (i = 0; i < E1000_INVM_SIZE; i++) {
                invm_dword = rd32(E1000_INVM_DATA_REG(i));
                buffer[i] = invm_dword;
        }

        /* Read version number */
        for (i = 1; i < invm_blocks; i++) {
                record = &buffer[invm_blocks - i];
                next_record = &buffer[invm_blocks - i + 1];

                /* Check if we have first version location used */
                if ((i == 1) && ((*record & E1000_INVM_VER_FIELD_ONE) == 0)) {
                        version = 0;
                        status = 0;
                        break;
                }
                /* Check if we have second version location used */
                else if ((i == 1) &&
                         ((*record & E1000_INVM_VER_FIELD_TWO) == 0)) {
                        version = (*record & E1000_INVM_VER_FIELD_ONE) >> 3;
                        status = 0;
                        break;
                }
                /* Check if we have odd version location
                 * used and it is the last one used
                 */
                else if ((((*record & E1000_INVM_VER_FIELD_ONE) == 0) &&
                         ((*record & 0x3) == 0)) || (((*record & 0x3) != 0) &&
                         (i != 1))) {
                        version = (*next_record & E1000_INVM_VER_FIELD_TWO)
                                  >> 13;
                        status = 0;
                        break;
                }
                /* Check if we have even version location
                 * used and it is the last one used
                 */
                else if (((*record & E1000_INVM_VER_FIELD_TWO) == 0) &&
                         ((*record & 0x3) == 0)) {
                        version = (*record & E1000_INVM_VER_FIELD_ONE) >> 3;
                        status = 0;
                        break;
                }
        }

        if (!status) {
                invm_ver->invm_major = (version & E1000_INVM_MAJOR_MASK)
                                        >> E1000_INVM_MAJOR_SHIFT;
                invm_ver->invm_minor = version & E1000_INVM_MINOR_MASK;
        }
        /* Read Image Type */
        for (i = 1; i < invm_blocks; i++) {
                record = &buffer[invm_blocks - i];
                next_record = &buffer[invm_blocks - i + 1];

                /* Check if we have image type in first location used */
                if ((i == 1) && ((*record & E1000_INVM_IMGTYPE_FIELD) == 0)) {
                        invm_ver->invm_img_type = 0;
                        status = 0;
                        break;
                }
                /* Check if we have image type in first location used */
                else if ((((*record & 0x3) == 0) &&
                         ((*record & E1000_INVM_IMGTYPE_FIELD) == 0)) ||
                         ((((*record & 0x3) != 0) && (i != 1)))) {
                        invm_ver->invm_img_type =
                                (*next_record & E1000_INVM_IMGTYPE_FIELD) >> 23;
                        status = 0;
                        break;
                }
        }
        return status;
}

/**
 *  igb_validate_nvm_checksum_i210 - 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 igb_validate_nvm_checksum_i210(struct e1000_hw *hw)
{
        s32 status = 0;
        s32 (*read_op_ptr)(struct e1000_hw *, u16, u16, u16 *);

        if (!(hw->nvm.ops.acquire(hw))) {

                /* Replace the read function with semaphore grabbing with
                 * the one that skips this for a while.
                 * We have semaphore taken already here.
                 */
                read_op_ptr = hw->nvm.ops.read;
                hw->nvm.ops.read = igb_read_nvm_eerd;

                status = igb_validate_nvm_checksum(hw);

                /* Revert original read operation. */
                hw->nvm.ops.read = read_op_ptr;

                hw->nvm.ops.release(hw);
        } else {
                status = E1000_ERR_SWFW_SYNC;
        }

        return status;
}

/**
 *  igb_update_nvm_checksum_i210 - 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. Next commit EEPROM data onto the Flash.
 **/
static s32 igb_update_nvm_checksum_i210(struct e1000_hw *hw)
{
        s32 ret_val = 0;
        u16 checksum = 0;
        u16 i, nvm_data;

        /* Read the first word from the EEPROM. If this times out or fails, do
         * not continue or we could be in for a very long wait while every
         * EEPROM read fails
         */
        ret_val = igb_read_nvm_eerd(hw, 0, 1, &nvm_data);
        if (ret_val) {
                hw_dbg("EEPROM read failed\n");
                goto out;
        }

        if (!(hw->nvm.ops.acquire(hw))) {
                /* Do not use hw->nvm.ops.write, hw->nvm.ops.read
                 * because we do not want to take the synchronization
                 * semaphores twice here.
                 */

                for (i = 0; i < NVM_CHECKSUM_REG; i++) {
                        ret_val = igb_read_nvm_eerd(hw, i, 1, &nvm_data);
                        if (ret_val) {
                                hw->nvm.ops.release(hw);
                                hw_dbg("NVM Read Error while updating checksum.\n");
                                goto out;
                        }
                        checksum += nvm_data;
                }
                checksum = (u16) NVM_SUM - checksum;
                ret_val = igb_write_nvm_srwr(hw, NVM_CHECKSUM_REG, 1,
                                                &checksum);
                if (ret_val) {
                        hw->nvm.ops.release(hw);
                        hw_dbg("NVM Write Error while updating checksum.\n");
                        goto out;
                }

                hw->nvm.ops.release(hw);

                ret_val = igb_update_flash_i210(hw);
        } else {
                ret_val = -E1000_ERR_SWFW_SYNC;
        }
out:
        return ret_val;
}

/**
 *  igb_pool_flash_update_done_i210 - Pool FLUDONE status.
 *  @hw: pointer to the HW structure
 *
 **/
static s32 igb_pool_flash_update_done_i210(struct e1000_hw *hw)
{
        s32 ret_val = -E1000_ERR_NVM;
        u32 i, reg;

        for (i = 0; i < E1000_FLUDONE_ATTEMPTS; i++) {
                reg = rd32(E1000_EECD);
                if (reg & E1000_EECD_FLUDONE_I210) {
                        ret_val = 0;
                        break;
                }
                udelay(5);
        }

        return ret_val;
}

/**
 *  igb_get_flash_presence_i210 - Check if flash device is detected.
 *  @hw: pointer to the HW structure
 *
 **/
bool igb_get_flash_presence_i210(struct e1000_hw *hw)
{
        u32 eec = 0;
        bool ret_val = false;

        eec = rd32(E1000_EECD);
        if (eec & E1000_EECD_FLASH_DETECTED_I210)
                ret_val = true;

        return ret_val;
}

/**
 *  igb_update_flash_i210 - Commit EEPROM to the flash
 *  @hw: pointer to the HW structure
 *
 **/
static s32 igb_update_flash_i210(struct e1000_hw *hw)
{
        s32 ret_val = 0;
        u32 flup;

        ret_val = igb_pool_flash_update_done_i210(hw);
        if (ret_val == -E1000_ERR_NVM) {
                hw_dbg("Flash update time out\n");
                goto out;
        }

        flup = rd32(E1000_EECD) | E1000_EECD_FLUPD_I210;
        wr32(E1000_EECD, flup);

        ret_val = igb_pool_flash_update_done_i210(hw);
        if (ret_val)
                hw_dbg("Flash update time out\n");
        else
                hw_dbg("Flash update complete\n");

out:
        return ret_val;
}

/**
 *  igb_valid_led_default_i210 - 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.
 **/
s32 igb_valid_led_default_i210(struct e1000_hw *hw, u16 *data)
{
        s32 ret_val;

        ret_val = hw->nvm.ops.read(hw, NVM_ID_LED_SETTINGS, 1, data);
        if (ret_val) {
                hw_dbg("NVM Read Error\n");
                goto out;
        }

        if (*data == ID_LED_RESERVED_0000 || *data == ID_LED_RESERVED_FFFF) {
                switch (hw->phy.media_type) {
                case e1000_media_type_internal_serdes:
                        *data = ID_LED_DEFAULT_I210_SERDES;
                        break;
                case e1000_media_type_copper:
                default:
                        *data = ID_LED_DEFAULT_I210;
                        break;
                }
        }
out:
        return ret_val;
}

/**
 *  __igb_access_xmdio_reg - Read/write XMDIO register
 *  @hw: pointer to the HW structure
 *  @address: XMDIO address to program
 *  @dev_addr: device address to program
 *  @data: pointer to value to read/write from/to the XMDIO address
 *  @read: boolean flag to indicate read or write
 **/
static s32 __igb_access_xmdio_reg(struct e1000_hw *hw, u16 address,
                                  u8 dev_addr, u16 *data, bool read)
{
        s32 ret_val = 0;

        ret_val = hw->phy.ops.write_reg(hw, E1000_MMDAC, dev_addr);
        if (ret_val)
                return ret_val;

        ret_val = hw->phy.ops.write_reg(hw, E1000_MMDAAD, address);
        if (ret_val)
                return ret_val;

        ret_val = hw->phy.ops.write_reg(hw, E1000_MMDAC, E1000_MMDAC_FUNC_DATA |
                                                         dev_addr);
        if (ret_val)
                return ret_val;

        if (read)
                ret_val = hw->phy.ops.read_reg(hw, E1000_MMDAAD, data);
        else
                ret_val = hw->phy.ops.write_reg(hw, E1000_MMDAAD, *data);
        if (ret_val)
                return ret_val;

        /* Recalibrate the device back to 0 */
        ret_val = hw->phy.ops.write_reg(hw, E1000_MMDAC, 0);
        if (ret_val)
                return ret_val;

        return ret_val;
}

/**
 *  igb_read_xmdio_reg - Read XMDIO register
 *  @hw: pointer to the HW structure
 *  @addr: XMDIO address to program
 *  @dev_addr: device address to program
 *  @data: value to be read from the EMI address
 **/
s32 igb_read_xmdio_reg(struct e1000_hw *hw, u16 addr, u8 dev_addr, u16 *data)
{
        return __igb_access_xmdio_reg(hw, addr, dev_addr, data, true);
}

/**
 *  igb_write_xmdio_reg - Write XMDIO register
 *  @hw: pointer to the HW structure
 *  @addr: XMDIO address to program
 *  @dev_addr: device address to program
 *  @data: value to be written to the XMDIO address
 **/
s32 igb_write_xmdio_reg(struct e1000_hw *hw, u16 addr, u8 dev_addr, u16 data)
{
        return __igb_access_xmdio_reg(hw, addr, dev_addr, &data, false);
}

/**
 *  igb_init_nvm_params_i210 - Init NVM func ptrs.
 *  @hw: pointer to the HW structure
 **/
s32 igb_init_nvm_params_i210(struct e1000_hw *hw)
{
        s32 ret_val = 0;
        struct e1000_nvm_info *nvm = &hw->nvm;

        nvm->ops.acquire = igb_acquire_nvm_i210;
        nvm->ops.release = igb_release_nvm_i210;
        nvm->ops.valid_led_default = igb_valid_led_default_i210;

        /* NVM Function Pointers */
        if (igb_get_flash_presence_i210(hw)) {
                hw->nvm.type = e1000_nvm_flash_hw;
                nvm->ops.read    = igb_read_nvm_srrd_i210;
                nvm->ops.write   = igb_write_nvm_srwr_i210;
                nvm->ops.validate = igb_validate_nvm_checksum_i210;
                nvm->ops.update   = igb_update_nvm_checksum_i210;
        } else {
                hw->nvm.type = e1000_nvm_invm;
                nvm->ops.read     = igb_read_invm_i210;
                nvm->ops.write    = NULL;
                nvm->ops.validate = NULL;
                nvm->ops.update   = NULL;
        }
        return ret_val;
}

/**
 * igb_pll_workaround_i210
 * @hw: pointer to the HW structure
 *
 * Works around an errata in the PLL circuit where it occasionally
 * provides the wrong clock frequency after power up.
 **/
s32 igb_pll_workaround_i210(struct e1000_hw *hw)
{
        s32 ret_val;
        u32 wuc, mdicnfg, ctrl, ctrl_ext, reg_val;
        u16 nvm_word, phy_word, pci_word, tmp_nvm;
        int i;

        /* Get and set needed register values */
        wuc = rd32(E1000_WUC);
        mdicnfg = rd32(E1000_MDICNFG);
        reg_val = mdicnfg & ~E1000_MDICNFG_EXT_MDIO;
        wr32(E1000_MDICNFG, reg_val);

        /* Get data from NVM, or set default */
        ret_val = igb_read_invm_word_i210(hw, E1000_INVM_AUTOLOAD,
                                          &nvm_word);
        if (ret_val)
                nvm_word = E1000_INVM_DEFAULT_AL;
        tmp_nvm = nvm_word | E1000_INVM_PLL_WO_VAL;
        igb_write_phy_reg_82580(hw, I347AT4_PAGE_SELECT, E1000_PHY_PLL_FREQ_PAGE);
        phy_word = E1000_PHY_PLL_UNCONF;
        for (i = 0; i < E1000_MAX_PLL_TRIES; i++) {
                /* check current state directly from internal PHY */
                igb_read_phy_reg_82580(hw, E1000_PHY_PLL_FREQ_REG, &phy_word);
                if ((phy_word & E1000_PHY_PLL_UNCONF)
                    != E1000_PHY_PLL_UNCONF) {
                        ret_val = 0;
                        break;
                } else {
                        ret_val = -E1000_ERR_PHY;
                }
                /* directly reset the internal PHY */
                ctrl = rd32(E1000_CTRL);
                wr32(E1000_CTRL, ctrl|E1000_CTRL_PHY_RST);

                ctrl_ext = rd32(E1000_CTRL_EXT);
                ctrl_ext |= (E1000_CTRL_EXT_PHYPDEN | E1000_CTRL_EXT_SDLPE);
                wr32(E1000_CTRL_EXT, ctrl_ext);

                wr32(E1000_WUC, 0);
                reg_val = (E1000_INVM_AUTOLOAD << 4) | (tmp_nvm << 16);
                wr32(E1000_EEARBC_I210, reg_val);

                igb_read_pci_cfg(hw, E1000_PCI_PMCSR, &pci_word);
                pci_word |= E1000_PCI_PMCSR_D3;
                igb_write_pci_cfg(hw, E1000_PCI_PMCSR, &pci_word);
                usleep_range(1000, 2000);
                pci_word &= ~E1000_PCI_PMCSR_D3;
                igb_write_pci_cfg(hw, E1000_PCI_PMCSR, &pci_word);
                reg_val = (E1000_INVM_AUTOLOAD << 4) | (nvm_word << 16);
                wr32(E1000_EEARBC_I210, reg_val);

                /* restore WUC register */
                wr32(E1000_WUC, wuc);
        }
        igb_write_phy_reg_82580(hw, I347AT4_PAGE_SELECT, 0);
        /* restore MDICNFG setting */
        wr32(E1000_MDICNFG, mdicnfg);
        return ret_val;
}

/**
 *  igb_get_cfg_done_i210 - Read config done bit
 *  @hw: pointer to the HW structure
 *
 *  Read the management control register for the config done bit for
 *  completion status.  NOTE: silicon which is EEPROM-less will fail trying
 *  to read the config done bit, so an error is *ONLY* logged and returns
 *  0.  If we were to return with error, EEPROM-less silicon
 *  would not be able to be reset or change link.
 **/
s32 igb_get_cfg_done_i210(struct e1000_hw *hw)
{
        s32 timeout = PHY_CFG_TIMEOUT;
        u32 mask = E1000_NVM_CFG_DONE_PORT_0;

        while (timeout) {
                if (rd32(E1000_EEMNGCTL_I210) & mask)
                        break;
                usleep_range(1000, 2000);
                timeout--;
        }
        if (!timeout)
                hw_dbg("MNG configuration cycle has not completed.\n");

        return 0;
}