ixgbe_common.c

/*******************************************************************************

  Intel 10 Gigabit PCI Express Linux driver
  Copyright(c) 1999 - 2007 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  Linux NICS <linux.nics@intel.com>
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

*******************************************************************************/

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

#include "ixgbe_common.h"
#include "ixgbe_phy.h"

static s32 ixgbe_clear_hw_cntrs(struct ixgbe_hw *hw);

static s32 ixgbe_poll_eeprom_eerd_done(struct ixgbe_hw *hw);
static s32 ixgbe_get_eeprom_semaphore(struct ixgbe_hw *hw);
static void ixgbe_release_eeprom_semaphore(struct ixgbe_hw *hw);
static u16 ixgbe_calc_eeprom_checksum(struct ixgbe_hw *hw);

static s32 ixgbe_clear_vfta(struct ixgbe_hw *hw);
static s32 ixgbe_init_rx_addrs(struct ixgbe_hw *hw);
static s32 ixgbe_mta_vector(struct ixgbe_hw *hw, u8 *mc_addr);
static void ixgbe_add_mc_addr(struct ixgbe_hw *hw, u8 *mc_addr);

/**
 *  ixgbe_start_hw - Prepare hardware for TX/RX
 *  @hw: pointer to hardware structure
 *
 *  Starts the hardware by filling the bus info structure and media type, clears
 *  all on chip counters, initializes receive address registers, multicast
 *  table, VLAN filter table, calls routine to set up link and flow control
 *  settings, and leaves transmit and receive units disabled and uninitialized
 **/
s32 ixgbe_start_hw(struct ixgbe_hw *hw)
{
	u32 ctrl_ext;

	/* Set the media type */
	hw->phy.media_type = hw->mac.ops.get_media_type(hw);

	/* Identify the PHY */
	ixgbe_identify_phy(hw);

	/*
	 * Store MAC address from RAR0, clear receive address registers, and
	 * clear the multicast table
	 */
	ixgbe_init_rx_addrs(hw);

	/* Clear the VLAN filter table */
	ixgbe_clear_vfta(hw);

	/* Set up link */
	hw->mac.ops.setup_link(hw);

	/* Clear statistics registers */
	ixgbe_clear_hw_cntrs(hw);

	/* Set No Snoop Disable */
	ctrl_ext = IXGBE_READ_REG(hw, IXGBE_CTRL_EXT);
	ctrl_ext |= IXGBE_CTRL_EXT_NS_DIS;
	IXGBE_WRITE_REG(hw, IXGBE_CTRL_EXT, ctrl_ext);
	IXGBE_WRITE_FLUSH(hw);

	/* Clear adapter stopped flag */
	hw->adapter_stopped = false;

	return 0;
}

/**
 *  ixgbe_init_hw - Generic hardware initialization
 *  @hw: pointer to hardware structure
 *
 *  Initialize the hardware by reseting the hardware, filling the bus info
 *  structure and media type, clears all on chip counters, initializes receive
 *  address registers, multicast table, VLAN filter table, calls routine to set
 *  up link and flow control settings, and leaves transmit and receive units
 *  disabled and uninitialized
 **/
s32 ixgbe_init_hw(struct ixgbe_hw *hw)
{
	/* Reset the hardware */
	hw->mac.ops.reset(hw);

	/* Start the HW */
	ixgbe_start_hw(hw);

	return 0;
}

/**
 *  ixgbe_clear_hw_cntrs - Generic clear hardware counters
 *  @hw: pointer to hardware structure
 *
 *  Clears all hardware statistics counters by reading them from the hardware
 *  Statistics counters are clear on read.
 **/
static s32 ixgbe_clear_hw_cntrs(struct ixgbe_hw *hw)
{
	u16 i = 0;

	IXGBE_READ_REG(hw, IXGBE_CRCERRS);
	IXGBE_READ_REG(hw, IXGBE_ILLERRC);
	IXGBE_READ_REG(hw, IXGBE_ERRBC);
	IXGBE_READ_REG(hw, IXGBE_MSPDC);
	for (i = 0; i < 8; i++)
		IXGBE_READ_REG(hw, IXGBE_MPC(i));

	IXGBE_READ_REG(hw, IXGBE_MLFC);
	IXGBE_READ_REG(hw, IXGBE_MRFC);
	IXGBE_READ_REG(hw, IXGBE_RLEC);
	IXGBE_READ_REG(hw, IXGBE_LXONTXC);
	IXGBE_READ_REG(hw, IXGBE_LXONRXC);
	IXGBE_READ_REG(hw, IXGBE_LXOFFTXC);
	IXGBE_READ_REG(hw, IXGBE_LXOFFRXC);

	for (i = 0; i < 8; i++) {
		IXGBE_READ_REG(hw, IXGBE_PXONTXC(i));
		IXGBE_READ_REG(hw, IXGBE_PXONRXC(i));
		IXGBE_READ_REG(hw, IXGBE_PXOFFTXC(i));
		IXGBE_READ_REG(hw, IXGBE_PXOFFRXC(i));
	}

	IXGBE_READ_REG(hw, IXGBE_PRC64);
	IXGBE_READ_REG(hw, IXGBE_PRC127);
	IXGBE_READ_REG(hw, IXGBE_PRC255);
	IXGBE_READ_REG(hw, IXGBE_PRC511);
	IXGBE_READ_REG(hw, IXGBE_PRC1023);
	IXGBE_READ_REG(hw, IXGBE_PRC1522);
	IXGBE_READ_REG(hw, IXGBE_GPRC);
	IXGBE_READ_REG(hw, IXGBE_BPRC);
	IXGBE_READ_REG(hw, IXGBE_MPRC);
	IXGBE_READ_REG(hw, IXGBE_GPTC);
	IXGBE_READ_REG(hw, IXGBE_GORCL);
	IXGBE_READ_REG(hw, IXGBE_GORCH);
	IXGBE_READ_REG(hw, IXGBE_GOTCL);
	IXGBE_READ_REG(hw, IXGBE_GOTCH);
	for (i = 0; i < 8; i++)
		IXGBE_READ_REG(hw, IXGBE_RNBC(i));
	IXGBE_READ_REG(hw, IXGBE_RUC);
	IXGBE_READ_REG(hw, IXGBE_RFC);
	IXGBE_READ_REG(hw, IXGBE_ROC);
	IXGBE_READ_REG(hw, IXGBE_RJC);
	IXGBE_READ_REG(hw, IXGBE_MNGPRC);
	IXGBE_READ_REG(hw, IXGBE_MNGPDC);
	IXGBE_READ_REG(hw, IXGBE_MNGPTC);
	IXGBE_READ_REG(hw, IXGBE_TORL);
	IXGBE_READ_REG(hw, IXGBE_TORH);
	IXGBE_READ_REG(hw, IXGBE_TPR);
	IXGBE_READ_REG(hw, IXGBE_TPT);
	IXGBE_READ_REG(hw, IXGBE_PTC64);
	IXGBE_READ_REG(hw, IXGBE_PTC127);
	IXGBE_READ_REG(hw, IXGBE_PTC255);
	IXGBE_READ_REG(hw, IXGBE_PTC511);
	IXGBE_READ_REG(hw, IXGBE_PTC1023);
	IXGBE_READ_REG(hw, IXGBE_PTC1522);
	IXGBE_READ_REG(hw, IXGBE_MPTC);
	IXGBE_READ_REG(hw, IXGBE_BPTC);
	for (i = 0; i < 16; i++) {
		IXGBE_READ_REG(hw, IXGBE_QPRC(i));
		IXGBE_READ_REG(hw, IXGBE_QBRC(i));
		IXGBE_READ_REG(hw, IXGBE_QPTC(i));
		IXGBE_READ_REG(hw, IXGBE_QBTC(i));
	}

	return 0;
}

/**
 *  ixgbe_get_mac_addr - Generic get MAC address
 *  @hw: pointer to hardware structure
 *  @mac_addr: Adapter MAC address
 *
 *  Reads the adapter's MAC address from first Receive Address Register (RAR0)
 *  A reset of the adapter must be performed prior to calling this function
 *  in order for the MAC address to have been loaded from the EEPROM into RAR0
 **/
s32 ixgbe_get_mac_addr(struct ixgbe_hw *hw, u8 *mac_addr)
{
	u32 rar_high;
	u32 rar_low;
	u16 i;

	rar_high = IXGBE_READ_REG(hw, IXGBE_RAH(0));
	rar_low = IXGBE_READ_REG(hw, IXGBE_RAL(0));

	for (i = 0; i < 4; i++)
		mac_addr[i] = (u8)(rar_low >> (i*8));

	for (i = 0; i < 2; i++)
		mac_addr[i+4] = (u8)(rar_high >> (i*8));

	return 0;
}

s32 ixgbe_read_part_num(struct ixgbe_hw *hw, u32 *part_num)
{
	s32 ret_val;
	u16 data;

	ret_val = ixgbe_read_eeprom(hw, IXGBE_PBANUM0_PTR, &data);
	if (ret_val) {
		hw_dbg(hw, "NVM Read Error\n");
		return ret_val;
	}
	*part_num = (u32)(data << 16);

	ret_val = ixgbe_read_eeprom(hw, IXGBE_PBANUM1_PTR, &data);
	if (ret_val) {
		hw_dbg(hw, "NVM Read Error\n");
		return ret_val;
	}
	*part_num |= data;

	return 0;
}

/**
 *  ixgbe_stop_adapter - Generic stop TX/RX units
 *  @hw: pointer to hardware structure
 *
 *  Sets the adapter_stopped flag within ixgbe_hw struct. Clears interrupts,
 *  disables transmit and receive units. The adapter_stopped flag is used by
 *  the shared code and drivers to determine if the adapter is in a stopped
 *  state and should not touch the hardware.
 **/
s32 ixgbe_stop_adapter(struct ixgbe_hw *hw)
{
	u32 number_of_queues;
	u32 reg_val;
	u16 i;

	/*
	 * Set the adapter_stopped flag so other driver functions stop touching
	 * the hardware
	 */
	hw->adapter_stopped = true;

	/* Disable the receive unit */
	reg_val = IXGBE_READ_REG(hw, IXGBE_RXCTRL);
	reg_val &= ~(IXGBE_RXCTRL_RXEN);
	IXGBE_WRITE_REG(hw, IXGBE_RXCTRL, reg_val);
	msleep(2);

	/* Clear interrupt mask to stop from interrupts being generated */
	IXGBE_WRITE_REG(hw, IXGBE_EIMC, IXGBE_IRQ_CLEAR_MASK);

	/* Clear any pending interrupts */
	IXGBE_READ_REG(hw, IXGBE_EICR);

	/* Disable the transmit unit.  Each queue must be disabled. */
	number_of_queues = hw->mac.num_tx_queues;
	for (i = 0; i < number_of_queues; i++) {
		reg_val = IXGBE_READ_REG(hw, IXGBE_TXDCTL(i));
		if (reg_val & IXGBE_TXDCTL_ENABLE) {
			reg_val &= ~IXGBE_TXDCTL_ENABLE;
			IXGBE_WRITE_REG(hw, IXGBE_TXDCTL(i), reg_val);
		}
	}

	return 0;
}

/**
 *  ixgbe_led_on - Turns on the software controllable LEDs.
 *  @hw: pointer to hardware structure
 *  @index: led number to turn on
 **/
s32 ixgbe_led_on(struct ixgbe_hw *hw, u32 index)
{
	u32 led_reg = IXGBE_READ_REG(hw, IXGBE_LEDCTL);

	/* To turn on the LED, set mode to ON. */
	led_reg &= ~IXGBE_LED_MODE_MASK(index);
	led_reg |= IXGBE_LED_ON << IXGBE_LED_MODE_SHIFT(index);
	IXGBE_WRITE_REG(hw, IXGBE_LEDCTL, led_reg);
	IXGBE_WRITE_FLUSH(hw);

	return 0;
}

/**
 *  ixgbe_led_off - Turns off the software controllable LEDs.
 *  @hw: pointer to hardware structure
 *  @index: led number to turn off
 **/
s32 ixgbe_led_off(struct ixgbe_hw *hw, u32 index)
{
	u32 led_reg = IXGBE_READ_REG(hw, IXGBE_LEDCTL);

	/* To turn off the LED, set mode to OFF. */
	led_reg &= ~IXGBE_LED_MODE_MASK(index);
	led_reg |= IXGBE_LED_OFF << IXGBE_LED_MODE_SHIFT(index);
	IXGBE_WRITE_REG(hw, IXGBE_LEDCTL, led_reg);
	IXGBE_WRITE_FLUSH(hw);

	return 0;
}


/**
 *  ixgbe_init_eeprom - Initialize EEPROM params
 *  @hw: pointer to hardware structure
 *
 *  Initializes the EEPROM parameters ixgbe_eeprom_info within the
 *  ixgbe_hw struct in order to set up EEPROM access.
 **/
s32 ixgbe_init_eeprom(struct ixgbe_hw *hw)
{
	struct ixgbe_eeprom_info *eeprom = &hw->eeprom;
	u32 eec;
	u16 eeprom_size;

	if (eeprom->type == ixgbe_eeprom_uninitialized) {
		eeprom->type = ixgbe_eeprom_none;

		/*
		 * Check for EEPROM present first.
		 * If not present leave as none
		 */
		eec = IXGBE_READ_REG(hw, IXGBE_EEC);
		if (eec & IXGBE_EEC_PRES) {
			eeprom->type = ixgbe_eeprom_spi;

			/*
			 * SPI EEPROM is assumed here.  This code would need to
			 * change if a future EEPROM is not SPI.
			 */
			eeprom_size = (u16)((eec & IXGBE_EEC_SIZE) >>
					    IXGBE_EEC_SIZE_SHIFT);
			eeprom->word_size = 1 << (eeprom_size +
						  IXGBE_EEPROM_WORD_SIZE_SHIFT);
		}

		if (eec & IXGBE_EEC_ADDR_SIZE)
			eeprom->address_bits = 16;
		else
			eeprom->address_bits = 8;
		hw_dbg(hw, "Eeprom params: type = %d, size = %d, address bits: "
			  "%d\n", eeprom->type, eeprom->word_size,
			  eeprom->address_bits);
	}

	return 0;
}

/**
 *  ixgbe_read_eeprom - Read EEPROM word using EERD
 *  @hw: pointer to hardware structure
 *  @offset: offset of  word in the EEPROM to read
 *  @data: word read from the EEPROM
 *
 *  Reads a 16 bit word from the EEPROM using the EERD register.
 **/
s32 ixgbe_read_eeprom(struct ixgbe_hw *hw, u16 offset, u16 *data)
{
	u32 eerd;
	s32 status;

	eerd = (offset << IXGBE_EEPROM_READ_ADDR_SHIFT) +
	       IXGBE_EEPROM_READ_REG_START;

	IXGBE_WRITE_REG(hw, IXGBE_EERD, eerd);
	status = ixgbe_poll_eeprom_eerd_done(hw);

	if (status == 0)
		*data = (IXGBE_READ_REG(hw, IXGBE_EERD) >>
			IXGBE_EEPROM_READ_REG_DATA);
	else
		hw_dbg(hw, "Eeprom read timed out\n");

	return status;
}

/**
 *  ixgbe_poll_eeprom_eerd_done - Poll EERD status
 *  @hw: pointer to hardware structure
 *
 *  Polls the status bit (bit 1) of the EERD to determine when the read is done.
 **/
static s32 ixgbe_poll_eeprom_eerd_done(struct ixgbe_hw *hw)
{
	u32 i;
	u32 reg;
	s32 status = IXGBE_ERR_EEPROM;

	for (i = 0; i < IXGBE_EERD_ATTEMPTS; i++) {
		reg = IXGBE_READ_REG(hw, IXGBE_EERD);
		if (reg & IXGBE_EEPROM_READ_REG_DONE) {
			status = 0;
			break;
		}
		udelay(5);
	}
	return status;
}

/**
 *  ixgbe_get_eeprom_semaphore - Get hardware semaphore
 *  @hw: pointer to hardware structure
 *
 *  Sets the hardware semaphores so EEPROM access can occur for bit-bang method
 **/
static s32 ixgbe_get_eeprom_semaphore(struct ixgbe_hw *hw)
{
	s32 status = IXGBE_ERR_EEPROM;
	u32 timeout;
	u32 i;
	u32 swsm;

	/* Set timeout value based on size of EEPROM */
	timeout = hw->eeprom.word_size + 1;

	/* Get SMBI software semaphore between device drivers first */
	for (i = 0; i < timeout; i++) {
		/*
		 * If the SMBI bit is 0 when we read it, then the bit will be
		 * set and we have the semaphore
		 */
		swsm = IXGBE_READ_REG(hw, IXGBE_SWSM);
		if (!(swsm & IXGBE_SWSM_SMBI)) {
			status = 0;
			break;
		}
		msleep(1);
	}

	/* Now get the semaphore between SW/FW through the SWESMBI bit */
	if (status == 0) {
		for (i = 0; i < timeout; i++) {
			swsm = IXGBE_READ_REG(hw, IXGBE_SWSM);

			/* Set the SW EEPROM semaphore bit to request access */
			swsm |= IXGBE_SWSM_SWESMBI;
			IXGBE_WRITE_REG(hw, IXGBE_SWSM, swsm);

			/*
			 * If we set the bit successfully then we got the
			 * semaphore.
			 */
			swsm = IXGBE_READ_REG(hw, IXGBE_SWSM);
			if (swsm & IXGBE_SWSM_SWESMBI)
				break;

			udelay(50);
		}

		/*
		 * Release semaphores and return error if SW EEPROM semaphore
		 * was not granted because we don't have access to the EEPROM
		 */
		if (i >= timeout) {
			hw_dbg(hw, "Driver can't access the Eeprom - Semaphore "
				 "not granted.\n");
			ixgbe_release_eeprom_semaphore(hw);
			status = IXGBE_ERR_EEPROM;
		}
	}

	return status;
}

/**
 *  ixgbe_release_eeprom_semaphore - Release hardware semaphore
 *  @hw: pointer to hardware structure
 *
 *  This function clears hardware semaphore bits.
 **/
static void ixgbe_release_eeprom_semaphore(struct ixgbe_hw *hw)
{
	u32 swsm;

	swsm = IXGBE_READ_REG(hw, IXGBE_SWSM);

	/* Release both semaphores by writing 0 to the bits SWESMBI and SMBI */
	swsm &= ~(IXGBE_SWSM_SWESMBI | IXGBE_SWSM_SMBI);
	IXGBE_WRITE_REG(hw, IXGBE_SWSM, swsm);
	IXGBE_WRITE_FLUSH(hw);
}

/**
 *  ixgbe_calc_eeprom_checksum - Calculates and returns the checksum
 *  @hw: pointer to hardware structure
 **/
static u16 ixgbe_calc_eeprom_checksum(struct ixgbe_hw *hw)
{
	u16 i;
	u16 j;
	u16 checksum = 0;
	u16 length = 0;
	u16 pointer = 0;
	u16 word = 0;

	/* Include 0x0-0x3F in the checksum */
	for (i = 0; i < IXGBE_EEPROM_CHECKSUM; i++) {
		if (ixgbe_read_eeprom(hw, i, &word) != 0) {
			hw_dbg(hw, "EEPROM read failed\n");
			break;
		}
		checksum += word;
	}

	/* Include all data from pointers except for the fw pointer */
	for (i = IXGBE_PCIE_ANALOG_PTR; i < IXGBE_FW_PTR; i++) {
		ixgbe_read_eeprom(hw, i, &pointer);

		/* Make sure the pointer seems valid */
		if (pointer != 0xFFFF && pointer != 0) {
			ixgbe_read_eeprom(hw, pointer, &length);

			if (length != 0xFFFF && length != 0) {
				for (j = pointer+1; j <= pointer+length; j++) {
					ixgbe_read_eeprom(hw, j, &word);
					checksum += word;
				}
			}
		}
	}

	checksum = (u16)IXGBE_EEPROM_SUM - checksum;

	return checksum;
}

/**
 *  ixgbe_validate_eeprom_checksum - Validate EEPROM checksum
 *  @hw: pointer to hardware structure
 *  @checksum_val: calculated checksum
 *
 *  Performs checksum calculation and validates the EEPROM checksum.  If the
 *  caller does not need checksum_val, the value can be NULL.
 **/
s32 ixgbe_validate_eeprom_checksum(struct ixgbe_hw *hw, u16 *checksum_val)
{
	s32 status;
	u16 checksum;
	u16 read_checksum = 0;

	/*
	 * 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
	 */
	status = ixgbe_read_eeprom(hw, 0, &checksum);

	if (status == 0) {
		checksum = ixgbe_calc_eeprom_checksum(hw);

		ixgbe_read_eeprom(hw, IXGBE_EEPROM_CHECKSUM, &read_checksum);

		/*
		 * Verify read checksum from EEPROM is the same as
		 * calculated checksum
		 */
		if (read_checksum != checksum)
			status = IXGBE_ERR_EEPROM_CHECKSUM;

		/* If the user cares, return the calculated checksum */
		if (checksum_val)
			*checksum_val = checksum;
	} else {
		hw_dbg(hw, "EEPROM read failed\n");
	}

	return status;
}

/**
 *  ixgbe_validate_mac_addr - Validate MAC address
 *  @mac_addr: pointer to MAC address.
 *
 *  Tests a MAC address to ensure it is a valid Individual Address
 **/
s32 ixgbe_validate_mac_addr(u8 *mac_addr)
{
	s32 status = 0;

	/* Make sure it is not a multicast address */
	if (IXGBE_IS_MULTICAST(mac_addr))
		status = IXGBE_ERR_INVALID_MAC_ADDR;
	/* Not a broadcast address */
	else if (IXGBE_IS_BROADCAST(mac_addr))
		status = IXGBE_ERR_INVALID_MAC_ADDR;
	/* Reject the zero address */
	else if (mac_addr[0] == 0 && mac_addr[1] == 0 && mac_addr[2] == 0 &&
		 mac_addr[3] == 0 && mac_addr[4] == 0 && mac_addr[5] == 0)
		status = IXGBE_ERR_INVALID_MAC_ADDR;

	return status;
}

/**
 *  ixgbe_set_rar - Set RX address register
 *  @hw: pointer to hardware structure
 *  @addr: Address to put into receive address register
 *  @index: Receive address register to write
 *  @vind: Vind to set RAR to
 *  @enable_addr: set flag that address is active
 *
 *  Puts an ethernet address into a receive address register.
 **/
s32 ixgbe_set_rar(struct ixgbe_hw *hw, u32 index, u8 *addr, u32 vind,
		  u32 enable_addr)
{
	u32 rar_low, rar_high;

	/*
	 * HW expects these in little endian so we reverse the byte order from
	 * network order (big endian) to little endian
	 */
	rar_low = ((u32)addr[0] |
		   ((u32)addr[1] << 8) |
		   ((u32)addr[2] << 16) |
		   ((u32)addr[3] << 24));

	rar_high = ((u32)addr[4] |
		    ((u32)addr[5] << 8) |
		    ((vind << IXGBE_RAH_VIND_SHIFT) & IXGBE_RAH_VIND_MASK));

	if (enable_addr != 0)
		rar_high |= IXGBE_RAH_AV;

	IXGBE_WRITE_REG(hw, IXGBE_RAL(index), rar_low);
	IXGBE_WRITE_REG(hw, IXGBE_RAH(index), rar_high);

	return 0;
}

/**
 *  ixgbe_init_rx_addrs - Initializes receive address filters.
 *  @hw: pointer to hardware structure
 *
 *  Places the MAC address in receive address register 0 and clears the rest
 *  of the receive addresss registers. Clears the multicast table. Assumes
 *  the receiver is in reset when the routine is called.
 **/
static s32 ixgbe_init_rx_addrs(struct ixgbe_hw *hw)
{
	u32 i;
	u32 rar_entries = hw->mac.num_rar_entries;

	/*
	 * If the current mac address is valid, assume it is a software override
	 * to the permanent address.
	 * Otherwise, use the permanent address from the eeprom.
	 */
	if (ixgbe_validate_mac_addr(hw->mac.addr) ==
	    IXGBE_ERR_INVALID_MAC_ADDR) {
		/* Get the MAC address from the RAR0 for later reference */
		ixgbe_get_mac_addr(hw, hw->mac.addr);

		hw_dbg(hw, " Keeping Current RAR0 Addr =%.2X %.2X %.2X ",
			  hw->mac.addr[0], hw->mac.addr[1],
			  hw->mac.addr[2]);
		hw_dbg(hw, "%.2X %.2X %.2X\n", hw->mac.addr[3],
			  hw->mac.addr[4], hw->mac.addr[5]);
	} else {
		/* Setup the receive address. */
		hw_dbg(hw, "Overriding MAC Address in RAR[0]\n");
		hw_dbg(hw, " New MAC Addr =%.2X %.2X %.2X ",
			  hw->mac.addr[0], hw->mac.addr[1],
			  hw->mac.addr[2]);
		hw_dbg(hw, "%.2X %.2X %.2X\n", hw->mac.addr[3],
			  hw->mac.addr[4], hw->mac.addr[5]);

		ixgbe_set_rar(hw, 0, hw->mac.addr, 0, IXGBE_RAH_AV);
	}

	hw->addr_ctrl.rar_used_count = 1;

	/* Zero out the other receive addresses. */
	hw_dbg(hw, "Clearing RAR[1-15]\n");
	for (i = 1; i < rar_entries; i++) {
		IXGBE_WRITE_REG(hw, IXGBE_RAL(i), 0);
		IXGBE_WRITE_REG(hw, IXGBE_RAH(i), 0);
	}

	/* Clear the MTA */
	hw->addr_ctrl.mc_addr_in_rar_count = 0;
	hw->addr_ctrl.mta_in_use = 0;
	IXGBE_WRITE_REG(hw, IXGBE_MCSTCTRL, hw->mac.mc_filter_type);

	hw_dbg(hw, " Clearing MTA\n");
	for (i = 0; i < hw->mac.mcft_size; i++)
		IXGBE_WRITE_REG(hw, IXGBE_MTA(i), 0);

	return 0;
}

/**
 *  ixgbe_add_uc_addr - Adds a secondary unicast address.
 *  @hw: pointer to hardware structure
 *  @addr: new address
 *
 *  Adds it to unused receive address register or goes into promiscuous mode.
 **/
void ixgbe_add_uc_addr(struct ixgbe_hw *hw, u8 *addr)
{
	u32 rar_entries = hw->mac.num_rar_entries;
	u32 rar;

	hw_dbg(hw, " UC Addr = %.2X %.2X %.2X %.2X %.2X %.2X\n",
	          addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);

	/*
	 * Place this address in the RAR if there is room,
	 * else put the controller into promiscuous mode
	 */
	if (hw->addr_ctrl.rar_used_count < rar_entries) {
		rar = hw->addr_ctrl.rar_used_count -
		      hw->addr_ctrl.mc_addr_in_rar_count;
		ixgbe_set_rar(hw, rar, addr, 0, IXGBE_RAH_AV);
		hw_dbg(hw, "Added a secondary address to RAR[%d]\n", rar);
		hw->addr_ctrl.rar_used_count++;
	} else {
		hw->addr_ctrl.overflow_promisc++;
	}

	hw_dbg(hw, "ixgbe_add_uc_addr Complete\n");
}

/**
 *  ixgbe_update_uc_addr_list - Updates MAC list of secondary addresses
 *  @hw: pointer to hardware structure
 *  @addr_list: the list of new addresses
 *  @addr_count: number of addresses
 *  @next: iterator function to walk the address list
 *
 *  The given list replaces any existing list.  Clears the secondary addrs from
 *  receive address registers.  Uses unused receive address registers for the
 *  first secondary addresses, and falls back to promiscuous mode as needed.
 *
 *  Drivers using secondary unicast addresses must set user_set_promisc when
 *  manually putting the device into promiscuous mode.
 **/
s32 ixgbe_update_uc_addr_list(struct ixgbe_hw *hw, u8 *addr_list,
                              u32 addr_count, ixgbe_mc_addr_itr next)
{
	u8 *addr;
	u32 i;
	u32 old_promisc_setting = hw->addr_ctrl.overflow_promisc;
	u32 uc_addr_in_use;
	u32 fctrl;
	u32 vmdq;

	/*
	 * Clear accounting of old secondary address list,
	 * don't count RAR[0]
	 */
	uc_addr_in_use = hw->addr_ctrl.rar_used_count -
	                 hw->addr_ctrl.mc_addr_in_rar_count - 1;
	hw->addr_ctrl.rar_used_count -= uc_addr_in_use;
	hw->addr_ctrl.overflow_promisc = 0;

	/* Zero out the other receive addresses */
	hw_dbg(hw, "Clearing RAR[1-%d]\n", uc_addr_in_use);
	for (i = 1; i <= uc_addr_in_use; i++) {
		IXGBE_WRITE_REG(hw, IXGBE_RAL(i), 0);
		IXGBE_WRITE_REG(hw, IXGBE_RAH(i), 0);
	}

	/* Add the new addresses */
	for (i = 0; i < addr_count; i++) {
		hw_dbg(hw, " Adding the secondary addresses:\n");
		addr = next(hw, &addr_list, &vmdq);
		ixgbe_add_uc_addr(hw, addr);
	}

	if (hw->addr_ctrl.overflow_promisc) {
		/* enable promisc if not already in overflow or set by user */
		if (!old_promisc_setting && !hw->addr_ctrl.user_set_promisc) {
			hw_dbg(hw, " Entering address overflow promisc mode\n");
			fctrl = IXGBE_READ_REG(hw, IXGBE_FCTRL);
			fctrl |= IXGBE_FCTRL_UPE;
			IXGBE_WRITE_REG(hw, IXGBE_FCTRL, fctrl);
		}
	} else {
		/* only disable if set by overflow, not by user */
		if (old_promisc_setting && !hw->addr_ctrl.user_set_promisc) {
			hw_dbg(hw, " Leaving address overflow promisc mode\n");
			fctrl = IXGBE_READ_REG(hw, IXGBE_FCTRL);
			fctrl &= ~IXGBE_FCTRL_UPE;
			IXGBE_WRITE_REG(hw, IXGBE_FCTRL, fctrl);
		}
	}

	hw_dbg(hw, "ixgbe_update_uc_addr_list Complete\n");
	return 0;
}

/**
 *  ixgbe_mta_vector - Determines bit-vector in multicast table to set
 *  @hw: pointer to hardware structure
 *  @mc_addr: the multicast address
 *
 *  Extracts the 12 bits, from a multicast address, to determine which
 *  bit-vector to set in the multicast table. The hardware uses 12 bits, from
 *  incoming rx multicast addresses, to determine the bit-vector to check in
 *  the MTA. Which of the 4 combination, of 12-bits, the hardware uses is set
 *  by the MO field of the MCSTCTRL. The MO field is set during initalization
 *  to mc_filter_type.
 **/
static s32 ixgbe_mta_vector(struct ixgbe_hw *hw, u8 *mc_addr)
{
	u32 vector = 0;

	switch (hw->mac.mc_filter_type) {
	case 0:	  /* use bits [47:36] of the address */
		vector = ((mc_addr[4] >> 4) | (((u16)mc_addr[5]) << 4));
		break;
	case 1:	  /* use bits [46:35] of the address */
		vector = ((mc_addr[4] >> 3) | (((u16)mc_addr[5]) << 5));
		break;
	case 2:	  /* use bits [45:34] of the address */
		vector = ((mc_addr[4] >> 2) | (((u16)mc_addr[5]) << 6));
		break;
	case 3:	  /* use bits [43:32] of the address */
		vector = ((mc_addr[4]) | (((u16)mc_addr[5]) << 8));
		break;
	default:	 /* Invalid mc_filter_type */
		hw_dbg(hw, "MC filter type param set incorrectly\n");
		break;
	}

	/* vector can only be 12-bits or boundary will be exceeded */
	vector &= 0xFFF;
	return vector;
}

/**
 *  ixgbe_set_mta - Set bit-vector in multicast table
 *  @hw: pointer to hardware structure
 *  @hash_value: Multicast address hash value
 *
 *  Sets the bit-vector in the multicast table.
 **/
static void ixgbe_set_mta(struct ixgbe_hw *hw, u8 *mc_addr)
{
	u32 vector;
	u32 vector_bit;
	u32 vector_reg;
	u32 mta_reg;

	hw->addr_ctrl.mta_in_use++;

	vector = ixgbe_mta_vector(hw, mc_addr);
	hw_dbg(hw, " bit-vector = 0x%03X\n", vector);

	/*
	 * The MTA is a register array of 128 32-bit registers. It is treated
	 * like an array of 4096 bits.  We want to set bit
	 * BitArray[vector_value]. So we figure out what register the bit is
	 * in, read it, OR in the new bit, then write back the new value.  The
	 * register is determined by the upper 7 bits of the vector value and
	 * the bit within that register are determined by the lower 5 bits of
	 * the value.
	 */
	vector_reg = (vector >> 5) & 0x7F;
	vector_bit = vector & 0x1F;
	mta_reg = IXGBE_READ_REG(hw, IXGBE_MTA(vector_reg));
	mta_reg |= (1 << vector_bit);
	IXGBE_WRITE_REG(hw, IXGBE_MTA(vector_reg), mta_reg);
}

/**
 *  ixgbe_add_mc_addr - Adds a multicast address.
 *  @hw: pointer to hardware structure
 *  @mc_addr: new multicast address
 *
 *  Adds it to unused receive address register or to the multicast table.
 **/
static void ixgbe_add_mc_addr(struct ixgbe_hw *hw, u8 *mc_addr)
{
	u32 rar_entries = hw->mac.num_rar_entries;
	u32 rar;

	hw_dbg(hw, " MC Addr =%.2X %.2X %.2X %.2X %.2X %.2X\n",
		  mc_addr[0], mc_addr[1], mc_addr[2],
		  mc_addr[3], mc_addr[4], mc_addr[5]);

	/*
	 * Place this multicast address in the RAR if there is room,
	 * else put it in the MTA
	 */
	if (hw->addr_ctrl.rar_used_count < rar_entries) {
		rar = rar_entries - hw->addr_ctrl.mc_addr_in_rar_count - 1;
		ixgbe_set_rar(hw, rar, mc_addr, 0, IXGBE_RAH_AV);
		hw_dbg(hw, "Added a multicast address to RAR[%d]\n",
			  hw->addr_ctrl.rar_used_count);
		hw->addr_ctrl.rar_used_count++;
		hw->addr_ctrl.mc_addr_in_rar_count++;
	} else {
		ixgbe_set_mta(hw, mc_addr);
	}

	hw_dbg(hw, "ixgbe_add_mc_addr Complete\n");
}

/**
 *  ixgbe_update_mc_addr_list - Updates MAC list of multicast addresses
 *  @hw: pointer to hardware structure
 *  @mc_addr_list: the list of new multicast addresses
 *  @mc_addr_count: number of addresses
 *  @next: iterator function to walk the multicast address list
 *
 *  The given list replaces any existing list. Clears the MC addrs from receive
 *  address registers and the multicast table. Uses unsed receive address
 *  registers for the first multicast addresses, and hashes the rest into the
 *  multicast table.
 **/
s32 ixgbe_update_mc_addr_list(struct ixgbe_hw *hw, u8 *mc_addr_list,
			      u32 mc_addr_count, ixgbe_mc_addr_itr next)
{
	u32 i;
	u32 rar_entries = hw->mac.num_rar_entries;
	u32 vmdq;

	/*
	 * Set the new number of MC addresses that we are being requested to
	 * use.
	 */
	hw->addr_ctrl.num_mc_addrs = mc_addr_count;
	hw->addr_ctrl.rar_used_count -= hw->addr_ctrl.mc_addr_in_rar_count;
	hw->addr_ctrl.mc_addr_in_rar_count = 0;
	hw->addr_ctrl.mta_in_use = 0;

	/* Zero out the other receive addresses. */
	hw_dbg(hw, "Clearing RAR[1-15]\n");
	for (i = hw->addr_ctrl.rar_used_count; i < rar_entries; i++) {
		IXGBE_WRITE_REG(hw, IXGBE_RAL(i), 0);
		IXGBE_WRITE_REG(hw, IXGBE_RAH(i), 0);
	}

	/* Clear the MTA */
	hw_dbg(hw, " Clearing MTA\n");
	for (i = 0; i < hw->mac.mcft_size; i++)
		IXGBE_WRITE_REG(hw, IXGBE_MTA(i), 0);

	/* Add the new addresses */
	for (i = 0; i < mc_addr_count; i++) {
		hw_dbg(hw, " Adding the multicast addresses:\n");
		ixgbe_add_mc_addr(hw, next(hw, &mc_addr_list, &vmdq));
	}

	/* Enable mta */
	if (hw->addr_ctrl.mta_in_use > 0)
		IXGBE_WRITE_REG(hw, IXGBE_MCSTCTRL,
				IXGBE_MCSTCTRL_MFE | hw->mac.mc_filter_type);

	hw_dbg(hw, "ixgbe_update_mc_addr_list Complete\n");
	return 0;
}

/**
 *  ixgbe_clear_vfta - 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(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_set_vfta - 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
 *
 *  Turn on/off specified VLAN in the VLAN filter table.
 **/
s32 ixgbe_set_vfta(struct ixgbe_hw *hw, u32 vlan, u32 vind,
		   bool vlan_on)
{
	u32 VftaIndex;
	u32 BitOffset;
	u32 VftaReg;
	u32 VftaByte;

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

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

	/* Set the nibble for VMD queue index */
	VftaReg = IXGBE_READ_REG(hw, IXGBE_VFTAVIND(VftaByte, VftaIndex));
	VftaReg &= (~(0x0F << BitOffset));
	VftaReg |= (vind << BitOffset);
	IXGBE_WRITE_REG(hw, IXGBE_VFTAVIND(VftaByte, VftaIndex), VftaReg);

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

	VftaReg = IXGBE_READ_REG(hw, IXGBE_VFTA(VftaIndex));
	if (vlan_on)
		/* Turn on this VLAN id */
		VftaReg |= (1 << BitOffset);
	else
		/* Turn off this VLAN id */
		VftaReg &= ~(1 << BitOffset);
	IXGBE_WRITE_REG(hw, IXGBE_VFTA(VftaIndex), VftaReg);

	return 0;
}

/**
 *  ixgbe_setup_fc - Configure flow control settings
 *  @hw: pointer to hardware structure
 *  @packetbuf_num: packet buffer number (0-7)
 *
 *  Configures the flow control settings based on SW configuration.
 *  This function is used for 802.3x flow control configuration only.
 **/
s32 ixgbe_setup_fc(struct ixgbe_hw *hw, s32 packetbuf_num)
{
	u32 frctl_reg;
	u32 rmcs_reg;

	if (packetbuf_num < 0 || packetbuf_num > 7)
		hw_dbg(hw, "Invalid packet buffer number [%d], expected range "
		       "is 0-7\n", packetbuf_num);

	frctl_reg = IXGBE_READ_REG(hw, IXGBE_FCTRL);
	frctl_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);

	/*
	 * 10 gig parts do not have a word in the EEPROM to determine the
	 * default flow control setting, so we explicitly set it to full.
	 */
	if (hw->fc.type == ixgbe_fc_default)
		hw->fc.type = ixgbe_fc_full;

	/*
	 * We want to save off the original Flow Control configuration just in
	 * case we get disconnected and then reconnected into a different hub
	 * or switch with different Flow Control capabilities.
	 */
	hw->fc.type = hw->fc.original_type;

	/*
	 * The possible values of the "flow_control" parameter are:
	 * 0: Flow control is completely disabled
	 * 1: Rx flow control is enabled (we can receive pause frames but not
	 *    send pause frames).
	 * 2: Tx flow control is enabled (we can send pause frames but we do not
	 *    support receiving pause frames)
	 * 3: Both Rx and TX flow control (symmetric) are enabled.
	 * other: Invalid.
	 */
	switch (hw->fc.type) {
	case ixgbe_fc_none:
		break;
	case ixgbe_fc_rx_pause:
		/*
		 * RX Flow control is enabled,
		 * and TX Flow control is disabled.
		 */
		frctl_reg |= IXGBE_FCTRL_RFCE;
		break;
	case ixgbe_fc_tx_pause:
		/*
		 * TX Flow control is enabled, and RX Flow control is disabled,
		 * by a software over-ride.
		 */
		rmcs_reg |= IXGBE_RMCS_TFCE_802_3X;
		break;
	case ixgbe_fc_full:
		/*
		 * Flow control (both RX and TX) is enabled by a software
		 * over-ride.
		 */
		frctl_reg |= IXGBE_FCTRL_RFCE;
		rmcs_reg |= IXGBE_RMCS_TFCE_802_3X;
		break;
	default:
		/* We should never get here.  The value should be 0-3. */
		hw_dbg(hw, "Flow control param set incorrectly\n");
		break;
	}

	/* Enable 802.3x based flow control settings. */
	IXGBE_WRITE_REG(hw, IXGBE_FCTRL, frctl_reg);
	IXGBE_WRITE_REG(hw, IXGBE_RMCS, rmcs_reg);

	/*
	 * Check for invalid software configuration, zeros are completely
	 * invalid for all parameters used past this point, and if we enable
	 * flow control with zero water marks, we blast flow control packets.
	 */
	if (!hw->fc.low_water || !hw->fc.high_water || !hw->fc.pause_time) {
		hw_dbg(hw, "Flow control structure initialized incorrectly\n");
		return IXGBE_ERR_INVALID_LINK_SETTINGS;
	}

	/*
	 * We need to set up the Receive Threshold high and low water
	 * marks as well as (optionally) enabling the transmission of
	 * XON frames.
	 */
	if (hw->fc.type & ixgbe_fc_tx_pause) {
		if (hw->fc.send_xon) {
			IXGBE_WRITE_REG(hw, IXGBE_FCRTL(packetbuf_num),
					(hw->fc.low_water | IXGBE_FCRTL_XONE));
		} else {
			IXGBE_WRITE_REG(hw, IXGBE_FCRTL(packetbuf_num),
					hw->fc.low_water);
		}
		IXGBE_WRITE_REG(hw, IXGBE_FCRTH(packetbuf_num),
				(hw->fc.high_water)|IXGBE_FCRTH_FCEN);
	}

	IXGBE_WRITE_REG(hw, IXGBE_FCTTV(0), hw->fc.pause_time);
	IXGBE_WRITE_REG(hw, IXGBE_FCRTV, (hw->fc.pause_time >> 1));

	return 0;
}

/**
 *  ixgbe_disable_pcie_master - Disable PCI-express master access
 *  @hw: pointer to hardware structure
 *
 *  Disables PCI-Express master access and verifies there are no pending
 *  requests. IXGBE_ERR_MASTER_REQUESTS_PENDING is returned if master disable
 *  bit hasn't caused the master requests to be disabled, else 0
 *  is returned signifying master requests disabled.
 **/
s32 ixgbe_disable_pcie_master(struct ixgbe_hw *hw)
{
	u32 ctrl;
	s32 i;
	s32 status = IXGBE_ERR_MASTER_REQUESTS_PENDING;

	ctrl = IXGBE_READ_REG(hw, IXGBE_CTRL);
	ctrl |= IXGBE_CTRL_GIO_DIS;
	IXGBE_WRITE_REG(hw, IXGBE_CTRL, ctrl);

	for (i = 0; i < IXGBE_PCI_MASTER_DISABLE_TIMEOUT; i++) {
		if (!(IXGBE_READ_REG(hw, IXGBE_STATUS) & IXGBE_STATUS_GIO)) {
			status = 0;
			break;
		}
		udelay(100);
	}

	return status;
}


/**
 *  ixgbe_acquire_swfw_sync - Aquire SWFW semaphore
 *  @hw: pointer to hardware structure
 *  @mask: Mask to specify wich semaphore to acquire
 *
 *  Aquires the SWFW semaphore throught the GSSR register for the specified
 *  function (CSR, PHY0, PHY1, EEPROM, Flash)
 **/
s32 ixgbe_acquire_swfw_sync(struct ixgbe_hw *hw, u16 mask)
{
	u32 gssr;
	u32 swmask = mask;
	u32 fwmask = mask << 5;
	s32 timeout = 200;

	while (timeout) {
		if (ixgbe_get_eeprom_semaphore(hw))
			return -IXGBE_ERR_SWFW_SYNC;

		gssr = IXGBE_READ_REG(hw, IXGBE_GSSR);
		if (!(gssr & (fwmask | swmask)))
			break;

		/*
		 * Firmware currently using resource (fwmask) or other software
		 * thread currently using resource (swmask)
		 */
		ixgbe_release_eeprom_semaphore(hw);
		msleep(5);
		timeout--;
	}

	if (!timeout) {
		hw_dbg(hw, "Driver can't access resource, GSSR timeout.\n");
		return -IXGBE_ERR_SWFW_SYNC;
	}

	gssr |= swmask;
	IXGBE_WRITE_REG(hw, IXGBE_GSSR, gssr);

	ixgbe_release_eeprom_semaphore(hw);
	return 0;
}

/**
 *  ixgbe_release_swfw_sync - Release SWFW semaphore
 *  @hw: pointer to hardware structure
 *  @mask: Mask to specify wich semaphore to release
 *
 *  Releases the SWFW semaphore throught the GSSR register for the specified
 *  function (CSR, PHY0, PHY1, EEPROM, Flash)
 **/
void ixgbe_release_swfw_sync(struct ixgbe_hw *hw, u16 mask)
{
	u32 gssr;
	u32 swmask = mask;

	ixgbe_get_eeprom_semaphore(hw);

	gssr = IXGBE_READ_REG(hw, IXGBE_GSSR);
	gssr &= ~swmask;
	IXGBE_WRITE_REG(hw, IXGBE_GSSR, gssr);

	ixgbe_release_eeprom_semaphore(hw);
}

/**
 *  ixgbe_read_analog_reg8 - Reads 8 bit Atlas analog register
 *  @hw: pointer to hardware structure
 *  @reg: analog register to read
 *  @val: read value
 *
 *  Performs write operation to analog register specified.
 **/
s32 ixgbe_read_analog_reg8(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 - 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.
 **/
s32 ixgbe_write_analog_reg8(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;
}