/*
 * CDDL HEADER START
 *
 * Copyright(c) 2007-2010 Intel Corporation. All rights reserved.
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at:
 *      http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When using or redistributing this file, you may do so under the
 * License only. No other modification of this header is permitted.
 *
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/* IntelVersion: 1.99 sol_ixgbe_shared_339b */

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

static void ixgbe_i2c_start(struct ixgbe_hw *hw);
static void ixgbe_i2c_stop(struct ixgbe_hw *hw);
static s32 ixgbe_clock_in_i2c_byte(struct ixgbe_hw *hw, u8 *data);
static s32 ixgbe_clock_out_i2c_byte(struct ixgbe_hw *hw, u8 data);
static s32 ixgbe_get_i2c_ack(struct ixgbe_hw *hw);
static s32 ixgbe_clock_in_i2c_bit(struct ixgbe_hw *hw, bool *data);
static s32 ixgbe_clock_out_i2c_bit(struct ixgbe_hw *hw, bool data);
static s32 ixgbe_raise_i2c_clk(struct ixgbe_hw *hw, u32 *i2cctl);
static void ixgbe_lower_i2c_clk(struct ixgbe_hw *hw, u32 *i2cctl);
static s32 ixgbe_set_i2c_data(struct ixgbe_hw *hw, u32 *i2cctl, bool data);
static bool ixgbe_get_i2c_data(u32 *i2cctl);
void ixgbe_i2c_bus_clear(struct ixgbe_hw *hw);

/*
 * ixgbe_init_phy_ops_generic - Inits PHY function ptrs
 * @hw: pointer to the hardware structure
 *
 * Initialize the function pointers.
 */
s32
ixgbe_init_phy_ops_generic(struct ixgbe_hw *hw)
{
	struct ixgbe_phy_info *phy = &hw->phy;

	DEBUGFUNC("ixgbe_init_phy_ops_generic");

	/* PHY */
	phy->ops.identify = &ixgbe_identify_phy_generic;
	phy->ops.reset = &ixgbe_reset_phy_generic;
	phy->ops.read_reg = &ixgbe_read_phy_reg_generic;
	phy->ops.write_reg = &ixgbe_write_phy_reg_generic;
	phy->ops.setup_link = &ixgbe_setup_phy_link_generic;
	phy->ops.setup_link_speed = &ixgbe_setup_phy_link_speed_generic;
	phy->ops.check_link = NULL;
	phy->ops.get_firmware_version = ixgbe_get_phy_firmware_version_generic;
	phy->ops.read_i2c_byte = &ixgbe_read_i2c_byte_generic;
	phy->ops.write_i2c_byte = &ixgbe_write_i2c_byte_generic;
	phy->ops.read_i2c_eeprom = &ixgbe_read_i2c_eeprom_generic;
	phy->ops.write_i2c_eeprom = &ixgbe_write_i2c_eeprom_generic;
	phy->ops.i2c_bus_clear = &ixgbe_i2c_bus_clear;
	phy->ops.identify_sfp = &ixgbe_identify_sfp_module_generic;
	phy->sfp_type = ixgbe_sfp_type_unknown;

	return (IXGBE_SUCCESS);
}

/*
 * ixgbe_identify_phy_generic - Get physical layer module
 * @hw: pointer to hardware structure
 *
 * Determines the physical layer module found on the current adapter.
 */
s32
ixgbe_identify_phy_generic(struct ixgbe_hw *hw)
{
	s32 status = IXGBE_ERR_PHY_ADDR_INVALID;
	u32 phy_addr;
	u16 ext_ability = 0;

	DEBUGFUNC("ixgbe_identify_phy_generic");

	if (hw->phy.type == ixgbe_phy_unknown) {
		for (phy_addr = 0; phy_addr < IXGBE_MAX_PHY_ADDR; phy_addr++) {
			if (ixgbe_validate_phy_addr(hw, phy_addr)) {
				hw->phy.addr = phy_addr;
				(void) ixgbe_get_phy_id(hw);
				hw->phy.type =
				    ixgbe_get_phy_type_from_id(hw->phy.id);

				if (hw->phy.type == ixgbe_phy_unknown) {
					hw->phy.ops.read_reg(hw,
					    IXGBE_MDIO_PHY_EXT_ABILITY,
					    IXGBE_MDIO_PMA_PMD_DEV_TYPE,
					    &ext_ability);
					if (ext_ability &
					    IXGBE_MDIO_PHY_10GBASET_ABILITY ||
					    ext_ability &
					    IXGBE_MDIO_PHY_1000BASET_ABILITY)
						hw->phy.type =
						    ixgbe_phy_cu_unknown;
					else
						hw->phy.type =
						    ixgbe_phy_generic;
				}

				status = IXGBE_SUCCESS;
				break;
			}
		}
		if (status != IXGBE_SUCCESS)
			hw->phy.addr = 0;
	} else {
		status = IXGBE_SUCCESS;
	}

	return (status);
}

/*
 * ixgbe_validate_phy_addr - Determines phy address is valid
 * @hw: pointer to hardware structure
 *
 */
bool
ixgbe_validate_phy_addr(struct ixgbe_hw *hw, u32 phy_addr)
{
	u16 phy_id = 0;
	bool valid = false;

	DEBUGFUNC("ixgbe_validate_phy_addr");

	hw->phy.addr = phy_addr;
	hw->phy.ops.read_reg(hw, IXGBE_MDIO_PHY_ID_HIGH,
	    IXGBE_MDIO_PMA_PMD_DEV_TYPE, &phy_id);

	if (phy_id != 0xFFFF && phy_id != 0x0)
		valid = true;

	return (valid);
}

/*
 * ixgbe_get_phy_id - Get the phy type
 * @hw: pointer to hardware structure
 *
 */
s32
ixgbe_get_phy_id(struct ixgbe_hw *hw)
{
	u32 status;
	u16 phy_id_high = 0;
	u16 phy_id_low = 0;

	DEBUGFUNC("ixgbe_get_phy_id");

	status = hw->phy.ops.read_reg(hw, IXGBE_MDIO_PHY_ID_HIGH,
	    IXGBE_MDIO_PMA_PMD_DEV_TYPE,
	    &phy_id_high);

	if (status == IXGBE_SUCCESS) {
		hw->phy.id = (u32)(phy_id_high << 16);
		status = hw->phy.ops.read_reg(hw, IXGBE_MDIO_PHY_ID_LOW,
		    IXGBE_MDIO_PMA_PMD_DEV_TYPE,
		    &phy_id_low);
		hw->phy.id |= (u32)(phy_id_low & IXGBE_PHY_REVISION_MASK);
		hw->phy.revision = (u32)(phy_id_low & ~IXGBE_PHY_REVISION_MASK);
	}

	return (status);
}

/*
 * ixgbe_get_phy_type_from_id - Get the phy type
 * @hw: pointer to hardware structure
 *
 */
enum ixgbe_phy_type
ixgbe_get_phy_type_from_id(u32 phy_id)
{
	enum ixgbe_phy_type phy_type;

	DEBUGFUNC("ixgbe_get_phy_type_from_id");

	switch (phy_id) {
	case TN1010_PHY_ID:
		phy_type = ixgbe_phy_tn;
		break;
	case AQ1002_PHY_ID:
		phy_type = ixgbe_phy_aq;
		break;
	case QT2022_PHY_ID:
		phy_type = ixgbe_phy_qt;
		break;
	case ATH_PHY_ID:
		phy_type = ixgbe_phy_nl;
		break;
	default:
		phy_type = ixgbe_phy_unknown;
		break;
	}

	DEBUGOUT1("phy type found is %d\n", phy_type);

	return (phy_type);
}

/*
 * ixgbe_reset_phy_generic - Performs a PHY reset
 * @hw: pointer to hardware structure
 */
s32
ixgbe_reset_phy_generic(struct ixgbe_hw *hw)
{
	u32 i;
	u16 ctrl = 0;
	s32 status = IXGBE_SUCCESS;

	DEBUGFUNC("ixgbe_reset_phy_generic");

	if (hw->phy.type == ixgbe_phy_unknown)
		status = ixgbe_identify_phy_generic(hw);

	if (status != IXGBE_SUCCESS || hw->phy.type == ixgbe_phy_none)
		goto out;

	/*
	 * Perform soft PHY reset to the PHY_XS.
	 * This will cause a soft reset to the PHY
	 */
	hw->phy.ops.write_reg(hw, IXGBE_MDIO_PHY_XS_CONTROL,
	    IXGBE_MDIO_PHY_XS_DEV_TYPE,
	    IXGBE_MDIO_PHY_XS_RESET);

	/* Poll for reset bit to self-clear indicating reset is complete */
	for (i = 0; i < 500; i++) {
		msec_delay(1);
		hw->phy.ops.read_reg(hw, IXGBE_MDIO_PHY_XS_CONTROL,
		    IXGBE_MDIO_PHY_XS_DEV_TYPE, &ctrl);
		if (!(ctrl & IXGBE_MDIO_PHY_XS_RESET))
			break;
	}

	if (ctrl & IXGBE_MDIO_PHY_XS_RESET) {
		status = IXGBE_ERR_RESET_FAILED;
		DEBUGOUT("PHY reset polling failed to complete.\n");
	}

out:
	return (status);
}

/*
 * ixgbe_read_phy_reg_generic - Reads a value from a specified PHY register
 * @hw: pointer to hardware structure
 * @reg_addr: 32 bit address of PHY register to read
 * @phy_data: Pointer to read data from PHY register
 */
s32
ixgbe_read_phy_reg_generic(struct ixgbe_hw *hw, u32 reg_addr,
    u32 device_type, u16 *phy_data)
{
	u32 command;
	u32 i;
	u32 data;
	s32 status = IXGBE_SUCCESS;
	u16 gssr;

	DEBUGFUNC("ixgbe_read_phy_reg_generic");

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

	if (ixgbe_acquire_swfw_sync(hw, gssr) != IXGBE_SUCCESS)
		status = IXGBE_ERR_SWFW_SYNC;

	if (status == IXGBE_SUCCESS) {
		/* Setup and write the address cycle command */
		command = ((reg_addr << IXGBE_MSCA_NP_ADDR_SHIFT)  |
		    (device_type << IXGBE_MSCA_DEV_TYPE_SHIFT) |
		    (hw->phy.addr << IXGBE_MSCA_PHY_ADDR_SHIFT) |
		    (IXGBE_MSCA_ADDR_CYCLE | IXGBE_MSCA_MDI_COMMAND));

		IXGBE_WRITE_REG(hw, IXGBE_MSCA, command);

		/*
		 * Check every 10 usec to see if the address cycle completed.
		 * The MDI Command bit will clear when the operation is
		 * complete
		 */
		for (i = 0; i < IXGBE_MDIO_COMMAND_TIMEOUT; i++) {
			usec_delay(10);

			command = IXGBE_READ_REG(hw, IXGBE_MSCA);

			if ((command & IXGBE_MSCA_MDI_COMMAND) == 0) {
				break;
			}
		}

		if ((command & IXGBE_MSCA_MDI_COMMAND) != 0) {
			DEBUGOUT("PHY address command did not complete.\n");
			status = IXGBE_ERR_PHY;
		}

		if (status == IXGBE_SUCCESS) {
			/*
			 * Address cycle complete, setup and write the read
			 * command
			 */
			command = ((reg_addr << IXGBE_MSCA_NP_ADDR_SHIFT)  |
			    (device_type << IXGBE_MSCA_DEV_TYPE_SHIFT) |
			    (hw->phy.addr << IXGBE_MSCA_PHY_ADDR_SHIFT) |
			    (IXGBE_MSCA_READ | IXGBE_MSCA_MDI_COMMAND));

			IXGBE_WRITE_REG(hw, IXGBE_MSCA, command);

			/*
			 * Check every 10 usec to see if the address cycle
			 * completed. The MDI Command bit will clear when the
			 * operation is complete
			 */
			for (i = 0; i < IXGBE_MDIO_COMMAND_TIMEOUT; i++) {
				usec_delay(10);

				command = IXGBE_READ_REG(hw, IXGBE_MSCA);

				if ((command & IXGBE_MSCA_MDI_COMMAND) == 0)
					break;
			}

			if ((command & IXGBE_MSCA_MDI_COMMAND) != 0) {
				DEBUGOUT("PHY read command didn't complete\n");
				status = IXGBE_ERR_PHY;
			} else {
				/*
				 * Read operation is complete.  Get the data
				 * from MSRWD
				 */
				data = IXGBE_READ_REG(hw, IXGBE_MSRWD);
				data >>= IXGBE_MSRWD_READ_DATA_SHIFT;
				*phy_data = (u16)(data);
			}
		}

		ixgbe_release_swfw_sync(hw, gssr);
	}

	return (status);
}

/*
 * ixgbe_write_phy_reg_generic - Writes a value to specified PHY register
 * @hw: pointer to hardware structure
 * @reg_addr: 32 bit PHY register to write
 * @device_type: 5 bit device type
 * @phy_data: Data to write to the PHY register
 */
s32 ixgbe_write_phy_reg_generic(struct ixgbe_hw *hw, u32 reg_addr,
    u32 device_type, u16 phy_data)
{
	u32 command;
	u32 i;
	s32 status = IXGBE_SUCCESS;
	u16 gssr;

	DEBUGFUNC("ixgbe_write_phy_reg_generic");

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

	if (ixgbe_acquire_swfw_sync(hw, gssr) != IXGBE_SUCCESS)
		status = IXGBE_ERR_SWFW_SYNC;

	if (status == IXGBE_SUCCESS) {
		/*
		 * Put the data in the MDI single read and write data register
		 */
		IXGBE_WRITE_REG(hw, IXGBE_MSRWD, (u32)phy_data);

		/* Setup and write the address cycle command */
		command = ((reg_addr << IXGBE_MSCA_NP_ADDR_SHIFT)  |
		    (device_type << IXGBE_MSCA_DEV_TYPE_SHIFT) |
		    (hw->phy.addr << IXGBE_MSCA_PHY_ADDR_SHIFT) |
		    (IXGBE_MSCA_ADDR_CYCLE | IXGBE_MSCA_MDI_COMMAND));

		IXGBE_WRITE_REG(hw, IXGBE_MSCA, command);

		/*
		 * Check every 10 usec to see if the address cycle completed.
		 * The MDI Command bit will clear when the operation is
		 * complete
		 */
		for (i = 0; i < IXGBE_MDIO_COMMAND_TIMEOUT; i++) {
			usec_delay(10);

			command = IXGBE_READ_REG(hw, IXGBE_MSCA);

			if ((command & IXGBE_MSCA_MDI_COMMAND) == 0)
				break;
		}

		if ((command & IXGBE_MSCA_MDI_COMMAND) != 0) {
			DEBUGOUT("PHY address cmd didn't complete\n");
			status = IXGBE_ERR_PHY;
		}

		if (status == IXGBE_SUCCESS) {
			/*
			 * Address cycle complete, setup and write the write
			 * command
			 */
			command = ((reg_addr << IXGBE_MSCA_NP_ADDR_SHIFT)  |
			    (device_type << IXGBE_MSCA_DEV_TYPE_SHIFT) |
			    (hw->phy.addr << IXGBE_MSCA_PHY_ADDR_SHIFT) |
			    (IXGBE_MSCA_WRITE | IXGBE_MSCA_MDI_COMMAND));

			IXGBE_WRITE_REG(hw, IXGBE_MSCA, command);

			/*
			 * Check every 10 usec to see if the address cycle
			 * completed. The MDI Command bit will clear when the
			 * operation is complete
			 */
			for (i = 0; i < IXGBE_MDIO_COMMAND_TIMEOUT; i++) {
				usec_delay(10);

				command = IXGBE_READ_REG(hw, IXGBE_MSCA);

				if ((command & IXGBE_MSCA_MDI_COMMAND) == 0)
					break;
			}

			if ((command & IXGBE_MSCA_MDI_COMMAND) != 0) {
				DEBUGOUT("PHY address cmd didn't complete\n");
				status = IXGBE_ERR_PHY;
			}
		}

		ixgbe_release_swfw_sync(hw, gssr);
	}

	return (status);
}

/*
 * ixgbe_setup_phy_link_generic - Set and restart autoneg
 * @hw: pointer to hardware structure
 *
 * Restart autonegotiation and PHY and waits for completion.
 */
s32
ixgbe_setup_phy_link_generic(struct ixgbe_hw *hw)
{
	s32 status = IXGBE_SUCCESS;
	u32 time_out;
	u32 max_time_out = 10;
	u16 autoneg_reg = IXGBE_MII_AUTONEG_REG;
	bool autoneg = false;
	ixgbe_link_speed speed;

	DEBUGFUNC("ixgbe_setup_phy_link_generic");

	(void) ixgbe_get_copper_link_capabilities_generic(hw, &speed, &autoneg);

	if (speed & IXGBE_LINK_SPEED_10GB_FULL) {
		/* Set or unset auto-negotiation 10G advertisement */
		hw->phy.ops.read_reg(hw, IXGBE_MII_10GBASE_T_AUTONEG_CTRL_REG,
		    IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
		    &autoneg_reg);

		autoneg_reg &= ~IXGBE_MII_10GBASE_T_ADVERTISE;
		if (hw->phy.autoneg_advertised & IXGBE_LINK_SPEED_10GB_FULL)
			autoneg_reg |= IXGBE_MII_10GBASE_T_ADVERTISE;

		hw->phy.ops.write_reg(hw, IXGBE_MII_10GBASE_T_AUTONEG_CTRL_REG,
		    IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
		    autoneg_reg);
	}

	if (speed & IXGBE_LINK_SPEED_1GB_FULL) {
		/* Set or unset auto-negotiation 1G advertisement */
		hw->phy.ops.read_reg(hw,
		    IXGBE_MII_AUTONEG_VENDOR_PROVISION_1_REG,
		    IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
		    &autoneg_reg);

		autoneg_reg &= ~IXGBE_MII_1GBASE_T_ADVERTISE;
		if (hw->phy.autoneg_advertised & IXGBE_LINK_SPEED_1GB_FULL)
			autoneg_reg |= IXGBE_MII_1GBASE_T_ADVERTISE;

		hw->phy.ops.write_reg(hw,
		    IXGBE_MII_AUTONEG_VENDOR_PROVISION_1_REG,
		    IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
		    autoneg_reg);
	}

	if (speed & IXGBE_LINK_SPEED_100_FULL) {
		/* Set or unset auto-negotiation 100M advertisement */
		hw->phy.ops.read_reg(hw, IXGBE_MII_AUTONEG_ADVERTISE_REG,
		    IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
		    &autoneg_reg);

		autoneg_reg &= ~IXGBE_MII_100BASE_T_ADVERTISE;
		if (hw->phy.autoneg_advertised & IXGBE_LINK_SPEED_100_FULL)
			autoneg_reg |= IXGBE_MII_100BASE_T_ADVERTISE;

		hw->phy.ops.write_reg(hw, IXGBE_MII_AUTONEG_ADVERTISE_REG,
		    IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
		    autoneg_reg);
	}

	/* Restart PHY autonegotiation and wait for completion */
	hw->phy.ops.read_reg(hw, IXGBE_MDIO_AUTO_NEG_CONTROL,
	    IXGBE_MDIO_AUTO_NEG_DEV_TYPE, &autoneg_reg);

	autoneg_reg |= IXGBE_MII_RESTART;

	hw->phy.ops.write_reg(hw, IXGBE_MDIO_AUTO_NEG_CONTROL,
	    IXGBE_MDIO_AUTO_NEG_DEV_TYPE, autoneg_reg);

	/* Wait for autonegotiation to finish */
	for (time_out = 0; time_out < max_time_out; time_out++) {
		usec_delay(10);
		/* Restart PHY autonegotiation and wait for completion */
		status = hw->phy.ops.read_reg(hw, IXGBE_MDIO_AUTO_NEG_STATUS,
		    IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
		    &autoneg_reg);

		autoneg_reg &= IXGBE_MII_AUTONEG_COMPLETE;
		if (autoneg_reg == IXGBE_MII_AUTONEG_COMPLETE) {
			break;
		}
	}

	if (time_out == max_time_out) {
		status = IXGBE_ERR_LINK_SETUP;
		DEBUGOUT("ixgbe_setup_phy_link_generic: time out");
	}

	return (status);
}

/*
 * ixgbe_setup_phy_link_speed_generic - Sets the auto advertised capabilities
 * @hw: pointer to hardware structure
 * @speed: new link speed
 * @autoneg: true if autonegotiation enabled
 */
s32
ixgbe_setup_phy_link_speed_generic(struct ixgbe_hw *hw,
    ixgbe_link_speed speed,
    bool autoneg,
    bool autoneg_wait_to_complete)
{
	UNREFERENCED_PARAMETER(autoneg);
	UNREFERENCED_PARAMETER(autoneg_wait_to_complete);

	DEBUGFUNC("ixgbe_setup_phy_link_speed_generic");

	/*
	 * Clear autoneg_advertised and set new values based on input link
	 * speed.
	 */
	hw->phy.autoneg_advertised = 0;

	if (speed & IXGBE_LINK_SPEED_10GB_FULL) {
		hw->phy.autoneg_advertised |= IXGBE_LINK_SPEED_10GB_FULL;
	}

	if (speed & IXGBE_LINK_SPEED_1GB_FULL) {
		hw->phy.autoneg_advertised |= IXGBE_LINK_SPEED_1GB_FULL;
	}

	if (speed & IXGBE_LINK_SPEED_100_FULL)
		hw->phy.autoneg_advertised |= IXGBE_LINK_SPEED_100_FULL;

	/* Setup link based on the new speed settings */
	hw->phy.ops.setup_link(hw);

	return (IXGBE_SUCCESS);
}

/*
 * ixgbe_get_copper_link_capabilities_generic - 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.
 */
s32
ixgbe_get_copper_link_capabilities_generic(struct ixgbe_hw *hw,
    ixgbe_link_speed *speed, bool *autoneg)
{
	s32 status = IXGBE_ERR_LINK_SETUP;
	u16 speed_ability;

	DEBUGFUNC("ixgbe_get_copper_link_capabilities_generic");

	*speed = 0;
	*autoneg = true;

	status = hw->phy.ops.read_reg(hw, IXGBE_MDIO_PHY_SPEED_ABILITY,
	    IXGBE_MDIO_PMA_PMD_DEV_TYPE, &speed_ability);

	if (status == IXGBE_SUCCESS) {
		if (speed_ability & IXGBE_MDIO_PHY_SPEED_10G)
			*speed |= IXGBE_LINK_SPEED_10GB_FULL;
		if (speed_ability & IXGBE_MDIO_PHY_SPEED_1G)
			*speed |= IXGBE_LINK_SPEED_1GB_FULL;
		if (speed_ability & IXGBE_MDIO_PHY_SPEED_100M)
			*speed |= IXGBE_LINK_SPEED_100_FULL;
	}

	return (status);
}

/*
 * ixgbe_check_phy_link_tnx - Determine link and speed status
 * @hw: pointer to hardware structure
 *
 * Reads the VS1 register to determine if link is up and the current speed for
 * the PHY.
 */
s32
ixgbe_check_phy_link_tnx(struct ixgbe_hw *hw, ixgbe_link_speed *speed,
    bool *link_up)
{
	s32 status = IXGBE_SUCCESS;
	u32 time_out;
	u32 max_time_out = 10;
	u16 phy_link = 0;
	u16 phy_speed = 0;
	u16 phy_data = 0;

	DEBUGFUNC("ixgbe_check_phy_link_tnx");

	/* Initialize speed and link to default case */
	*link_up = false;
	*speed = IXGBE_LINK_SPEED_10GB_FULL;

	/*
	 * Check current speed and link status of the PHY register.
	 * This is a vendor specific register and may have to
	 * be changed for other copper PHYs.
	 */
	for (time_out = 0; time_out < max_time_out; time_out++) {
		usec_delay(10);
		status = hw->phy.ops.read_reg(hw,
		    IXGBE_MDIO_VENDOR_SPECIFIC_1_STATUS,
		    IXGBE_MDIO_VENDOR_SPECIFIC_1_DEV_TYPE,
		    &phy_data);
		phy_link = phy_data &
		    IXGBE_MDIO_VENDOR_SPECIFIC_1_LINK_STATUS;
		phy_speed = phy_data &
		    IXGBE_MDIO_VENDOR_SPECIFIC_1_SPEED_STATUS;
		if (phy_link == IXGBE_MDIO_VENDOR_SPECIFIC_1_LINK_STATUS) {
			*link_up = true;
			if (phy_speed ==
			    IXGBE_MDIO_VENDOR_SPECIFIC_1_SPEED_STATUS)
				*speed = IXGBE_LINK_SPEED_1GB_FULL;
			break;
		}
	}

	return (status);
}

/*
 * ixgbe_setup_phy_link_tnx - Set and restart autoneg
 * @hw: pointer to hardware structure
 *
 * Restart autonegotiation and PHY and waits for completion.
 */
s32
ixgbe_setup_phy_link_tnx(struct ixgbe_hw *hw)
{
	s32 status = IXGBE_SUCCESS;
	u32 time_out;
	u32 max_time_out = 10;
	u16 autoneg_reg = IXGBE_MII_AUTONEG_REG;
	bool autoneg = false;
	ixgbe_link_speed speed;

	DEBUGFUNC("ixgbe_setup_phy_link_tnx");

	(void) ixgbe_get_copper_link_capabilities_generic(hw, &speed, &autoneg);

	if (speed & IXGBE_LINK_SPEED_10GB_FULL) {
		/* Set or unset auto-negotiation 10G advertisement */
		hw->phy.ops.read_reg(hw, IXGBE_MII_10GBASE_T_AUTONEG_CTRL_REG,
		    IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
		    &autoneg_reg);

		autoneg_reg &= ~IXGBE_MII_10GBASE_T_ADVERTISE;
		if (hw->phy.autoneg_advertised & IXGBE_LINK_SPEED_10GB_FULL)
			autoneg_reg |= IXGBE_MII_10GBASE_T_ADVERTISE;

		hw->phy.ops.write_reg(hw, IXGBE_MII_10GBASE_T_AUTONEG_CTRL_REG,
		    IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
		    autoneg_reg);
	}

	if (speed & IXGBE_LINK_SPEED_1GB_FULL) {
		/* Set or unset auto-negotiation 1G advertisement */
		hw->phy.ops.read_reg(hw, IXGBE_MII_AUTONEG_XNP_TX_REG,
		    IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
		    &autoneg_reg);

		autoneg_reg &= ~IXGBE_MII_1GBASE_T_ADVERTISE_XNP_TX;
		if (hw->phy.autoneg_advertised & IXGBE_LINK_SPEED_1GB_FULL)
			autoneg_reg |= IXGBE_MII_1GBASE_T_ADVERTISE_XNP_TX;

		hw->phy.ops.write_reg(hw, IXGBE_MII_AUTONEG_XNP_TX_REG,
		    IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
		    autoneg_reg);
	}

	if (speed & IXGBE_LINK_SPEED_100_FULL) {
		/* Set or unset auto-negotiation 100M advertisement */
		hw->phy.ops.read_reg(hw, IXGBE_MII_AUTONEG_ADVERTISE_REG,
		    IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
		    &autoneg_reg);

		autoneg_reg &= ~IXGBE_MII_100BASE_T_ADVERTISE;
		if (hw->phy.autoneg_advertised & IXGBE_LINK_SPEED_100_FULL)
			autoneg_reg |= IXGBE_MII_100BASE_T_ADVERTISE;

		hw->phy.ops.write_reg(hw, IXGBE_MII_AUTONEG_ADVERTISE_REG,
		    IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
		    autoneg_reg);
	}

	/* Restart PHY autonegotiation and wait for completion */
	hw->phy.ops.read_reg(hw, IXGBE_MDIO_AUTO_NEG_CONTROL,
	    IXGBE_MDIO_AUTO_NEG_DEV_TYPE, &autoneg_reg);

	autoneg_reg |= IXGBE_MII_RESTART;

	hw->phy.ops.write_reg(hw, IXGBE_MDIO_AUTO_NEG_CONTROL,
	    IXGBE_MDIO_AUTO_NEG_DEV_TYPE, autoneg_reg);

	/* Wait for autonegotiation to finish */
	for (time_out = 0; time_out < max_time_out; time_out++) {
		usec_delay(10);
		/* Restart PHY autonegotiation and wait for completion */
		status = hw->phy.ops.read_reg(hw, IXGBE_MDIO_AUTO_NEG_STATUS,
		    IXGBE_MDIO_AUTO_NEG_DEV_TYPE,
		    &autoneg_reg);

		autoneg_reg &= IXGBE_MII_AUTONEG_COMPLETE;
		if (autoneg_reg == IXGBE_MII_AUTONEG_COMPLETE) {
			break;
		}
	}

	if (time_out == max_time_out) {
		status = IXGBE_ERR_LINK_SETUP;
		DEBUGOUT("ixgbe_setup_phy_link_tnx: time out");
	}

	return (status);
}

/*
 * ixgbe_get_phy_firmware_version_tnx - Gets the PHY Firmware Version
 * @hw: pointer to hardware structure
 * @firmware_version: pointer to the PHY Firmware Version
 */
s32
ixgbe_get_phy_firmware_version_tnx(struct ixgbe_hw *hw, u16 *firmware_version)
{
	s32 status = IXGBE_SUCCESS;

	DEBUGFUNC("ixgbe_get_phy_firmware_version_tnx");

	status = hw->phy.ops.read_reg(hw, TNX_FW_REV,
	    IXGBE_MDIO_VENDOR_SPECIFIC_1_DEV_TYPE, firmware_version);

	return (status);
}

/*
 * ixgbe_get_phy_firmware_version_generic - Gets the PHY Firmware Version
 * @hw: pointer to hardware structure
 * @firmware_version: pointer to the PHY Firmware Version
 */
s32
ixgbe_get_phy_firmware_version_generic(struct ixgbe_hw *hw,
    u16 *firmware_version)
{
	s32 status = IXGBE_SUCCESS;

	DEBUGFUNC("ixgbe_get_phy_firmware_version_generic");

	status = hw->phy.ops.read_reg(hw, AQ_FW_REV,
	    IXGBE_MDIO_VENDOR_SPECIFIC_1_DEV_TYPE, firmware_version);

	return (status);
}

/*
 * ixgbe_reset_phy_nl - Performs a PHY reset
 * @hw: pointer to hardware structure
 */
s32
ixgbe_reset_phy_nl(struct ixgbe_hw *hw)
{
	u16 phy_offset, control, eword, edata, block_crc;
	bool end_data = false;
	u16 list_offset, data_offset;
	u16 phy_data = 0;
	s32 ret_val = IXGBE_SUCCESS;
	u32 i;

	DEBUGFUNC("ixgbe_reset_phy_nl");

	hw->phy.ops.read_reg(hw, IXGBE_MDIO_PHY_XS_CONTROL,
	    IXGBE_MDIO_PHY_XS_DEV_TYPE, &phy_data);

	/* reset the PHY and poll for completion */
	hw->phy.ops.write_reg(hw, IXGBE_MDIO_PHY_XS_CONTROL,
	    IXGBE_MDIO_PHY_XS_DEV_TYPE,
	    (phy_data | IXGBE_MDIO_PHY_XS_RESET));

	for (i = 0; i < 100; i++) {
		hw->phy.ops.read_reg(hw, IXGBE_MDIO_PHY_XS_CONTROL,
		    IXGBE_MDIO_PHY_XS_DEV_TYPE, &phy_data);
		if ((phy_data & IXGBE_MDIO_PHY_XS_RESET) == 0)
			break;
		msec_delay(10);
	}

	if ((phy_data & IXGBE_MDIO_PHY_XS_RESET) != 0) {
		DEBUGOUT("PHY reset did not complete.\n");
		ret_val = IXGBE_ERR_PHY;
		goto out;
	}

	/* Get init offsets */
	ret_val = ixgbe_get_sfp_init_sequence_offsets(hw, &list_offset,
	    &data_offset);
	if (ret_val != IXGBE_SUCCESS)
		goto out;

	ret_val = hw->eeprom.ops.read(hw, data_offset, &block_crc);
	data_offset++;
	while (!end_data) {
		/*
		 * Read control word from PHY init contents offset
		 */
		ret_val = hw->eeprom.ops.read(hw, data_offset, &eword);
		control = (eword & IXGBE_CONTROL_MASK_NL) >>
		    IXGBE_CONTROL_SHIFT_NL;
		edata = eword & IXGBE_DATA_MASK_NL;
		switch (control) {
		case IXGBE_DELAY_NL:
			data_offset++;
			DEBUGOUT1("DELAY: %d MS\n", edata);
			msec_delay(edata);
			break;
		case IXGBE_DATA_NL:
			DEBUGOUT("DATA:  \n");
			data_offset++;
			hw->eeprom.ops.read(hw, data_offset++, &phy_offset);
			for (i = 0; i < edata; i++) {
				hw->eeprom.ops.read(hw, data_offset, &eword);
				hw->phy.ops.write_reg(hw, phy_offset,
				    IXGBE_TWINAX_DEV, eword);
				DEBUGOUT2("Wrote %4.4x to %4.4x\n", eword,
				    phy_offset);
				data_offset++;
				phy_offset++;
			}
			break;
		case IXGBE_CONTROL_NL:
			data_offset++;
			DEBUGOUT("CONTROL: \n");
			if (edata == IXGBE_CONTROL_EOL_NL) {
				DEBUGOUT("EOL\n");
				end_data = true;
			} else if (edata == IXGBE_CONTROL_SOL_NL) {
				DEBUGOUT("SOL\n");
			} else {
				DEBUGOUT("Bad control value\n");
				ret_val = IXGBE_ERR_PHY;
				goto out;
			}
			break;
		default:
			DEBUGOUT("Bad control type\n");
			ret_val = IXGBE_ERR_PHY;
			goto out;
		}
	}

out:
	return (ret_val);
}

/*
 * ixgbe_identify_sfp_module_generic - Identifies SFP module
 * @hw: pointer to hardware structure
 *
 * Searches for and identifies the SFP module and assigns appropriate PHY type.
 */
s32
ixgbe_identify_sfp_module_generic(struct ixgbe_hw *hw)
{
	s32 status = IXGBE_ERR_PHY_ADDR_INVALID;
	u32 vendor_oui = 0;
	enum ixgbe_sfp_type stored_sfp_type = hw->phy.sfp_type;
	u8 identifier = 0;
	u8 comp_codes_1g = 0;
	u8 comp_codes_10g = 0;
	u8 oui_bytes[3] = {0, 0, 0};
	u8 cable_tech = 0;
	u16 enforce_sfp = 0;

	DEBUGFUNC("ixgbe_identify_sfp_module_generic");

	if (hw->mac.ops.get_media_type(hw) != ixgbe_media_type_fiber) {
		hw->phy.sfp_type = ixgbe_sfp_type_not_present;
		status = IXGBE_ERR_SFP_NOT_PRESENT;
		goto out;
	}

	status = hw->phy.ops.read_i2c_eeprom(hw,
	    IXGBE_SFF_IDENTIFIER, &identifier);

	if (status == IXGBE_ERR_SFP_NOT_PRESENT || status == IXGBE_ERR_I2C) {
		status = IXGBE_ERR_SFP_NOT_PRESENT;
		hw->phy.sfp_type = ixgbe_sfp_type_not_present;
		if (hw->phy.type != ixgbe_phy_nl) {
			hw->phy.id = 0;
			hw->phy.type = ixgbe_phy_unknown;
		}
		goto out;
	}

	/* LAN ID is needed for sfp_type determination */
	hw->mac.ops.set_lan_id(hw);

	if (identifier != IXGBE_SFF_IDENTIFIER_SFP) {
		hw->phy.type = ixgbe_phy_sfp_unsupported;
		status = IXGBE_ERR_SFP_NOT_SUPPORTED;
	} else {
		hw->phy.ops.read_i2c_eeprom(hw, IXGBE_SFF_1GBE_COMP_CODES,
		    &comp_codes_1g);
		hw->phy.ops.read_i2c_eeprom(hw, IXGBE_SFF_10GBE_COMP_CODES,
		    &comp_codes_10g);
		hw->phy.ops.read_i2c_eeprom(hw, IXGBE_SFF_CABLE_TECHNOLOGY,
		    &cable_tech);

		/*
		 * ID  Module
		 * ============
		 * 0    SFP_DA_CU
		 * 1    SFP_SR
		 * 2    SFP_LR
		 * 3	SFP_DA_CORE0 - 82599-specific
		 * 4	SFP_DA_CORE1 - 82599-specific
		 * 5	SFP_SR/LR_CORE0 - 82599-specific
		 * 6	SFP_SR/LR_CORE1 - 82599-specific
		 */
		if (hw->mac.type == ixgbe_mac_82598EB) {
			if (cable_tech & IXGBE_SFF_DA_PASSIVE_CABLE)
				hw->phy.sfp_type = ixgbe_sfp_type_da_cu;
			else if (comp_codes_10g & IXGBE_SFF_10GBASESR_CAPABLE)
				hw->phy.sfp_type = ixgbe_sfp_type_sr;
			else if (comp_codes_10g & IXGBE_SFF_10GBASELR_CAPABLE)
				hw->phy.sfp_type = ixgbe_sfp_type_lr;
			else
				hw->phy.sfp_type = ixgbe_sfp_type_unknown;
		} else if (hw->mac.type == ixgbe_mac_82599EB) {
			if (cable_tech & IXGBE_SFF_DA_PASSIVE_CABLE)
				if (hw->bus.lan_id == 0)
					hw->phy.sfp_type =
					    ixgbe_sfp_type_da_cu_core0;
				else
					hw->phy.sfp_type =
					    ixgbe_sfp_type_da_cu_core1;
			else if (comp_codes_10g & IXGBE_SFF_10GBASESR_CAPABLE)
				if (hw->bus.lan_id == 0)
					hw->phy.sfp_type =
					    ixgbe_sfp_type_srlr_core0;
				else
					hw->phy.sfp_type =
					    ixgbe_sfp_type_srlr_core1;
			else if (comp_codes_10g & IXGBE_SFF_10GBASELR_CAPABLE)
				if (hw->bus.lan_id == 0)
					hw->phy.sfp_type =
					    ixgbe_sfp_type_srlr_core0;
				else
					hw->phy.sfp_type =
					    ixgbe_sfp_type_srlr_core1;
			else
				hw->phy.sfp_type = ixgbe_sfp_type_unknown;
		}

		if (hw->phy.sfp_type != stored_sfp_type)
			hw->phy.sfp_setup_needed = true;

		/* Determine if the SFP+ PHY is dual speed or not. */
		hw->phy.multispeed_fiber = false;
		if (((comp_codes_1g & IXGBE_SFF_1GBASESX_CAPABLE) &&
		    (comp_codes_10g & IXGBE_SFF_10GBASESR_CAPABLE)) ||
		    ((comp_codes_1g & IXGBE_SFF_1GBASELX_CAPABLE) &&
		    (comp_codes_10g & IXGBE_SFF_10GBASELR_CAPABLE)))
			hw->phy.multispeed_fiber = true;

		/* Determine PHY vendor */
		if (hw->phy.type != ixgbe_phy_nl) {
			hw->phy.id = identifier;
			hw->phy.ops.read_i2c_eeprom(hw,
			    IXGBE_SFF_VENDOR_OUI_BYTE0, &oui_bytes[0]);
			hw->phy.ops.read_i2c_eeprom(hw,
			    IXGBE_SFF_VENDOR_OUI_BYTE1, &oui_bytes[1]);
			hw->phy.ops.read_i2c_eeprom(hw,
			    IXGBE_SFF_VENDOR_OUI_BYTE2, &oui_bytes[2]);

			vendor_oui =
			    ((oui_bytes[0] <<
			    IXGBE_SFF_VENDOR_OUI_BYTE0_SHIFT) |
			    (oui_bytes[1] << IXGBE_SFF_VENDOR_OUI_BYTE1_SHIFT) |
			    (oui_bytes[2] << IXGBE_SFF_VENDOR_OUI_BYTE2_SHIFT));

			switch (vendor_oui) {
			case IXGBE_SFF_VENDOR_OUI_TYCO:
				if (cable_tech & IXGBE_SFF_DA_PASSIVE_CABLE)
					hw->phy.type = ixgbe_phy_tw_tyco;
				break;
			case IXGBE_SFF_VENDOR_OUI_FTL:
				hw->phy.type = ixgbe_phy_sfp_ftl;
				break;
			case IXGBE_SFF_VENDOR_OUI_AVAGO:
				hw->phy.type = ixgbe_phy_sfp_avago;
				break;
			case IXGBE_SFF_VENDOR_OUI_INTEL:
				hw->phy.type = ixgbe_phy_sfp_intel;
				break;
			default:
				if (cable_tech & IXGBE_SFF_DA_PASSIVE_CABLE)
					hw->phy.type = ixgbe_phy_tw_unknown;
				else
					hw->phy.type = ixgbe_phy_sfp_unknown;
				break;
			}
		}

		/* All passive DA cables are supported */
		if (cable_tech & IXGBE_SFF_DA_PASSIVE_CABLE) {
			status = IXGBE_SUCCESS;
			goto out;
		}

		/* 1G SFP modules are not supported */
		if (comp_codes_10g == 0) {
			hw->phy.type = ixgbe_phy_sfp_unsupported;
			status = IXGBE_ERR_SFP_NOT_SUPPORTED;
			goto out;
		}

		/* Anything else 82598-based is supported */
		if (hw->mac.type == ixgbe_mac_82598EB) {
			status = IXGBE_SUCCESS;
			goto out;
		}

		(void) ixgbe_get_device_caps(hw, &enforce_sfp);
		if (!(enforce_sfp & IXGBE_DEVICE_CAPS_ALLOW_ANY_SFP)) {
			/* Make sure we're a supported PHY type */
			if (hw->phy.type == ixgbe_phy_sfp_intel) {
				status = IXGBE_SUCCESS;
			} else {
				DEBUGOUT("SFP+ module not supported\n");
				hw->phy.type = ixgbe_phy_sfp_unsupported;
				status = IXGBE_ERR_SFP_NOT_SUPPORTED;
			}
		} else {
			status = IXGBE_SUCCESS;
		}
	}

out:
	return (status);
}


/*
 * ixgbe_get_sfp_init_sequence_offsets - Provides offset of PHY init sequence
 * @hw: pointer to hardware structure
 * @list_offset: offset to the SFP ID list
 * @data_offset: offset to the SFP data block
 *
 * Checks the MAC's EEPROM to see if it supports a given SFP+ module type, if
 * so it returns the offsets to the phy init sequence block.
 */
s32 ixgbe_get_sfp_init_sequence_offsets(struct ixgbe_hw *hw,
    u16 *list_offset, u16 *data_offset)
{
	u16 sfp_id;

	DEBUGFUNC("ixgbe_get_sfp_init_sequence_offsets");

	if (hw->phy.sfp_type == ixgbe_sfp_type_unknown)
		return (IXGBE_ERR_SFP_NOT_SUPPORTED);

	if (hw->phy.sfp_type == ixgbe_sfp_type_not_present)
		return (IXGBE_ERR_SFP_NOT_PRESENT);

	if ((hw->device_id == IXGBE_DEV_ID_82598_SR_DUAL_PORT_EM) &&
	    (hw->phy.sfp_type == ixgbe_sfp_type_da_cu))
		return (IXGBE_ERR_SFP_NOT_SUPPORTED);

	/* Read offset to PHY init contents */
	hw->eeprom.ops.read(hw, IXGBE_PHY_INIT_OFFSET_NL, list_offset);

	if ((!*list_offset) || (*list_offset == 0xFFFF))
		return (IXGBE_ERR_SFP_NO_INIT_SEQ_PRESENT);

	/* Shift offset to first ID word */
	(*list_offset)++;

	/*
	 * Find the matching SFP ID in the EEPROM
	 * and program the init sequence
	 */
	hw->eeprom.ops.read(hw, *list_offset, &sfp_id);

	while (sfp_id != IXGBE_PHY_INIT_END_NL) {
		if (sfp_id == hw->phy.sfp_type) {
			(*list_offset)++;
			hw->eeprom.ops.read(hw, *list_offset, data_offset);
			if ((!*data_offset) || (*data_offset == 0xFFFF)) {
				DEBUGOUT("SFP+ module not supported\n");
				return (IXGBE_ERR_SFP_NOT_SUPPORTED);
			} else {
				break;
			}
		} else {
			(*list_offset) += 2;
			if (hw->eeprom.ops.read(hw, *list_offset, &sfp_id))
				return (IXGBE_ERR_PHY);
		}
	}

	if (sfp_id == IXGBE_PHY_INIT_END_NL) {
		DEBUGOUT("No matching SFP+ module found\n");
		return (IXGBE_ERR_SFP_NOT_SUPPORTED);
	}

	return (IXGBE_SUCCESS);
}

/*
 * ixgbe_read_i2c_eeprom_generic - Reads 8 bit EEPROM word over I2C interface
 * @hw: pointer to hardware structure
 * @byte_offset: EEPROM byte offset to read
 * @eeprom_data: value read
 *
 * Performs byte read operation to SFP module's EEPROM over I2C interface.
 */
s32
ixgbe_read_i2c_eeprom_generic(struct ixgbe_hw *hw, u8 byte_offset,
    u8 *eeprom_data)
{
	DEBUGFUNC("ixgbe_read_i2c_eeprom_generic");

	return (hw->phy.ops.read_i2c_byte(hw, byte_offset,
	    IXGBE_I2C_EEPROM_DEV_ADDR, eeprom_data));
}

/*
 * ixgbe_write_i2c_eeprom_generic - Writes 8 bit EEPROM word over I2C interface
 * @hw: pointer to hardware structure
 * @byte_offset: EEPROM byte offset to write
 * @eeprom_data: value to write
 *
 * Performs byte write operation to SFP module's EEPROM over I2C interface.
 */
s32 ixgbe_write_i2c_eeprom_generic(struct ixgbe_hw *hw, u8 byte_offset,
    u8 eeprom_data)
{
	DEBUGFUNC("ixgbe_write_i2c_eeprom_generic");

	return (hw->phy.ops.write_i2c_byte(hw, byte_offset,
	    IXGBE_I2C_EEPROM_DEV_ADDR, eeprom_data));
}

/*
 * ixgbe_read_i2c_byte_generic - Reads 8 bit word over I2C
 * @hw: pointer to hardware structure
 * @byte_offset: byte offset to read
 * @data: value read
 *
 * Performs byte read operation to SFP module's EEPROM over I2C interface at
 * a specified deivce address.
 */
s32
ixgbe_read_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
    u8 dev_addr, u8 *data)
{
	s32 status = IXGBE_SUCCESS;
	u32 max_retry = 10;
	u32 retry = 0;
	u16 swfw_mask = 0;
	bool nack = 1;

	DEBUGFUNC("ixgbe_read_i2c_byte_generic");

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

	do {
		if (ixgbe_acquire_swfw_sync(hw, swfw_mask) != IXGBE_SUCCESS) {
			status = IXGBE_ERR_SWFW_SYNC;
			goto read_byte_out;
		}

		ixgbe_i2c_start(hw);

		/* Device Address and write indication */
		status = ixgbe_clock_out_i2c_byte(hw, dev_addr);
		if (status != IXGBE_SUCCESS)
			goto fail;

		status = ixgbe_get_i2c_ack(hw);
		if (status != IXGBE_SUCCESS)
			goto fail;

		status = ixgbe_clock_out_i2c_byte(hw, byte_offset);
		if (status != IXGBE_SUCCESS)
			goto fail;

		status = ixgbe_get_i2c_ack(hw);
		if (status != IXGBE_SUCCESS)
			goto fail;

		ixgbe_i2c_start(hw);

		/* Device Address and read indication */
		status = ixgbe_clock_out_i2c_byte(hw, (dev_addr | 0x1));
		if (status != IXGBE_SUCCESS)
			goto fail;

		status = ixgbe_get_i2c_ack(hw);
		if (status != IXGBE_SUCCESS)
			goto fail;

		status = ixgbe_clock_in_i2c_byte(hw, data);
		if (status != IXGBE_SUCCESS)
			goto fail;

		status = ixgbe_clock_out_i2c_bit(hw, nack);
		if (status != IXGBE_SUCCESS)
			goto fail;

		ixgbe_i2c_stop(hw);
		break;

fail:
		ixgbe_release_swfw_sync(hw, swfw_mask);
		msec_delay(100);
		ixgbe_i2c_bus_clear(hw);
		retry++;
		if (retry < max_retry)
			DEBUGOUT("I2C byte read error - Retrying.\n");
		else
			DEBUGOUT("I2C byte read error.\n");
	} while (retry < max_retry);

	ixgbe_release_swfw_sync(hw, swfw_mask);

read_byte_out:
	return (status);
}

/*
 * ixgbe_write_i2c_byte_generic - Writes 8 bit word over I2C
 * @hw: pointer to hardware structure
 * @byte_offset: byte offset to write
 * @data: value to write
 *
 * Performs byte write operation to SFP module's EEPROM over I2C interface at
 * a specified device address.
 */
s32
ixgbe_write_i2c_byte_generic(struct ixgbe_hw *hw, u8 byte_offset,
    u8 dev_addr, u8 data)
{
	s32 status = IXGBE_SUCCESS;
	u32 max_retry = 1;
	u32 retry = 0;
	u16 swfw_mask = 0;

	DEBUGFUNC("ixgbe_write_i2c_byte_generic");

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

	if (ixgbe_acquire_swfw_sync(hw, swfw_mask) != IXGBE_SUCCESS) {
		status = IXGBE_ERR_SWFW_SYNC;
		goto write_byte_out;
	}

	do {
		ixgbe_i2c_start(hw);

		status = ixgbe_clock_out_i2c_byte(hw, dev_addr);
		if (status != IXGBE_SUCCESS)
			goto fail;

		status = ixgbe_get_i2c_ack(hw);
		if (status != IXGBE_SUCCESS)
			goto fail;

		status = ixgbe_clock_out_i2c_byte(hw, byte_offset);
		if (status != IXGBE_SUCCESS)
			goto fail;

		status = ixgbe_get_i2c_ack(hw);
		if (status != IXGBE_SUCCESS)
			goto fail;

		status = ixgbe_clock_out_i2c_byte(hw, data);
		if (status != IXGBE_SUCCESS)
			goto fail;

		status = ixgbe_get_i2c_ack(hw);
		if (status != IXGBE_SUCCESS)
			goto fail;

		ixgbe_i2c_stop(hw);
		break;

fail:
		ixgbe_i2c_bus_clear(hw);
		retry++;
		if (retry < max_retry)
			DEBUGOUT("I2C byte write error - Retrying.\n");
		else
			DEBUGOUT("I2C byte write error.\n");
	} while (retry < max_retry);

	ixgbe_release_swfw_sync(hw, swfw_mask);

write_byte_out:
	return (status);
}

/*
 * ixgbe_i2c_start - Sets I2C start condition
 * @hw: pointer to hardware structure
 *
 * Sets I2C start condition (High -> Low on SDA while SCL is High)
 */
static void
ixgbe_i2c_start(struct ixgbe_hw *hw)
{
	u32 i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL);

	DEBUGFUNC("ixgbe_i2c_start");

	/* Start condition must begin with data and clock high */
	(void) ixgbe_set_i2c_data(hw, &i2cctl, 1);
	(void) ixgbe_raise_i2c_clk(hw, &i2cctl);

	/* Setup time for start condition (4.7us) */
	usec_delay(IXGBE_I2C_T_SU_STA);

	(void) ixgbe_set_i2c_data(hw, &i2cctl, 0);

	/* Hold time for start condition (4us) */
	usec_delay(IXGBE_I2C_T_HD_STA);

	ixgbe_lower_i2c_clk(hw, &i2cctl);

	/* Minimum low period of clock is 4.7 us */
	usec_delay(IXGBE_I2C_T_LOW);
}

/*
 * ixgbe_i2c_stop - Sets I2C stop condition
 * @hw: pointer to hardware structure
 *
 * Sets I2C stop condition (Low -> High on SDA while SCL is High)
 */
static void
ixgbe_i2c_stop(struct ixgbe_hw *hw)
{
	u32 i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL);

	DEBUGFUNC("ixgbe_i2c_stop");

	/* Stop condition must begin with data low and clock high */
	(void) ixgbe_set_i2c_data(hw, &i2cctl, 0);
	(void) ixgbe_raise_i2c_clk(hw, &i2cctl);

	/* Setup time for stop condition (4us) */
	usec_delay(IXGBE_I2C_T_SU_STO);

	(void) ixgbe_set_i2c_data(hw, &i2cctl, 1);

	/* bus free time between stop and start (4.7us) */
	usec_delay(IXGBE_I2C_T_BUF);
}

/*
 * ixgbe_clock_in_i2c_byte - Clocks in one byte via I2C
 * @hw: pointer to hardware structure
 * @data: data byte to clock in
 *
 * Clocks in one byte data via I2C data/clock
 */
static s32
ixgbe_clock_in_i2c_byte(struct ixgbe_hw *hw, u8 *data)
{
	s32 status = IXGBE_SUCCESS;
	s32 i;
	bool bit = 0;

	DEBUGFUNC("ixgbe_clock_in_i2c_byte");

	for (i = 7; i >= 0; i--) {
		status = ixgbe_clock_in_i2c_bit(hw, &bit);
		*data |= bit<<i;

		if (status != IXGBE_SUCCESS)
			break;
	}

	return (status);
}

/*
 * ixgbe_clock_out_i2c_byte - Clocks out one byte via I2C
 * @hw: pointer to hardware structure
 * @data: data byte clocked out
 *
 * Clocks out one byte data via I2C data/clock
 */
static s32
ixgbe_clock_out_i2c_byte(struct ixgbe_hw *hw, u8 data)
{
	s32 status = IXGBE_SUCCESS;
	s32 i;
	u32 i2cctl;
	bool bit = 0;

	DEBUGFUNC("ixgbe_clock_out_i2c_byte");

	for (i = 7; i >= 0; i--) {
		bit = (data >> i) & 0x1;
		status = ixgbe_clock_out_i2c_bit(hw, bit);

		if (status != IXGBE_SUCCESS)
			break;
	}

	/* Release SDA line (set high) */
	i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL);
	i2cctl |= IXGBE_I2C_DATA_OUT;
	IXGBE_WRITE_REG(hw, IXGBE_I2CCTL, i2cctl);

	return (status);
}

/*
 * ixgbe_get_i2c_ack - Polls for I2C ACK
 * @hw: pointer to hardware structure
 *
 * Clocks in/out one bit via I2C data/clock
 */
static s32
ixgbe_get_i2c_ack(struct ixgbe_hw *hw)
{
	s32 status;
	u32 i = 0;
	u32 i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL);
	u32 timeout = 10;
	bool ack = 1;

	DEBUGFUNC("ixgbe_get_i2c_ack");

	status = ixgbe_raise_i2c_clk(hw, &i2cctl);

	if (status != IXGBE_SUCCESS)
		goto out;

	/* Minimum high period of clock is 4us */
	usec_delay(IXGBE_I2C_T_HIGH);

	/*
	 * Poll for ACK.  Note that ACK in I2C spec is
	 * transition from 1 to 0
	 */
	for (i = 0; i < timeout; i++) {
		i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL);
		ack = ixgbe_get_i2c_data(&i2cctl);

		usec_delay(1);
		if (ack == 0)
			break;
	}

	if (ack == 1) {
		DEBUGOUT("I2C ack was not received.\n");
		status = IXGBE_ERR_I2C;
	}

	ixgbe_lower_i2c_clk(hw, &i2cctl);

	/* Minimum low period of clock is 4.7 us */
	usec_delay(IXGBE_I2C_T_LOW);

out:
	return (status);
}

/*
 * ixgbe_clock_in_i2c_bit - Clocks in one bit via I2C data/clock
 * @hw: pointer to hardware structure
 * @data: read data value
 *
 * Clocks in one bit via I2C data/clock
 */
static s32
ixgbe_clock_in_i2c_bit(struct ixgbe_hw *hw, bool *data)
{
	s32 status;
	u32 i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL);

	DEBUGFUNC("ixgbe_clock_in_i2c_bit");

	status = ixgbe_raise_i2c_clk(hw, &i2cctl);

	/* Minimum high period of clock is 4us */
	usec_delay(IXGBE_I2C_T_HIGH);

	i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL);
	*data = ixgbe_get_i2c_data(&i2cctl);

	ixgbe_lower_i2c_clk(hw, &i2cctl);

	/* Minimum low period of clock is 4.7 us */
	usec_delay(IXGBE_I2C_T_LOW);

	return (status);
}

/*
 * ixgbe_clock_out_i2c_bit - Clocks in/out one bit via I2C data/clock
 * @hw: pointer to hardware structure
 * @data: data value to write
 *
 * Clocks out one bit via I2C data/clock
 */
static s32
ixgbe_clock_out_i2c_bit(struct ixgbe_hw *hw, bool data)
{
	s32 status;
	u32 i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL);

	DEBUGFUNC("ixgbe_clock_out_i2c_bit");

	status = ixgbe_set_i2c_data(hw, &i2cctl, data);
	if (status == IXGBE_SUCCESS) {
		status = ixgbe_raise_i2c_clk(hw, &i2cctl);

		/* Minimum high period of clock is 4us */
		usec_delay(IXGBE_I2C_T_HIGH);

		ixgbe_lower_i2c_clk(hw, &i2cctl);

		/*
		 * Minimum low period of clock is 4.7 us.
		 * This also takes care of the data hold time.
		 */
		usec_delay(IXGBE_I2C_T_LOW);
	} else {
		status = IXGBE_ERR_I2C;
		DEBUGOUT1("I2C data was not set to %X\n", data);
	}

	return (status);
}

/*
 * ixgbe_raise_i2c_clk - Raises the I2C SCL clock
 * @hw: pointer to hardware structure
 * @i2cctl: Current value of I2CCTL register
 *
 * Raises the I2C clock line '0'->'1'
 */
static s32
ixgbe_raise_i2c_clk(struct ixgbe_hw *hw, u32 *i2cctl)
{
	s32 status = IXGBE_SUCCESS;

	DEBUGFUNC("ixgbe_raise_i2c_clk");

	*i2cctl |= IXGBE_I2C_CLK_OUT;

	IXGBE_WRITE_REG(hw, IXGBE_I2CCTL, *i2cctl);

	/* SCL rise time (1000ns) */
	usec_delay(IXGBE_I2C_T_RISE);

	return (status);
}

/*
 * ixgbe_lower_i2c_clk - Lowers the I2C SCL clock
 * @hw: pointer to hardware structure
 * @i2cctl: Current value of I2CCTL register
 *
 * Lowers the I2C clock line '1'->'0'
 */
static void
ixgbe_lower_i2c_clk(struct ixgbe_hw *hw, u32 *i2cctl)
{
	DEBUGFUNC("ixgbe_lower_i2c_clk");

	*i2cctl &= ~IXGBE_I2C_CLK_OUT;

	IXGBE_WRITE_REG(hw, IXGBE_I2CCTL, *i2cctl);

	/* SCL fall time (300ns) */
	usec_delay(IXGBE_I2C_T_FALL);
}

/*
 * ixgbe_set_i2c_data - Sets the I2C data bit
 * @hw: pointer to hardware structure
 * @i2cctl: Current value of I2CCTL register
 * @data: I2C data value (0 or 1) to set
 *
 * Sets the I2C data bit
 */
static s32
ixgbe_set_i2c_data(struct ixgbe_hw *hw, u32 *i2cctl, bool data)
{
	s32 status = IXGBE_SUCCESS;

	DEBUGFUNC("ixgbe_set_i2c_data");

	if (data)
		*i2cctl |= IXGBE_I2C_DATA_OUT;
	else
		*i2cctl &= ~IXGBE_I2C_DATA_OUT;

	IXGBE_WRITE_REG(hw, IXGBE_I2CCTL, *i2cctl);

	/* Data rise/fall (1000ns/300ns) and set-up time (250ns) */
	usec_delay(IXGBE_I2C_T_RISE + IXGBE_I2C_T_FALL + IXGBE_I2C_T_SU_DATA);

	/* Verify data was set correctly */
	*i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL);
	if (data != ixgbe_get_i2c_data(i2cctl)) {
		status = IXGBE_ERR_I2C;
		DEBUGOUT1("Error - I2C data was not set to %X.\n", data);
	}

	return (status);
}

/*
 * ixgbe_get_i2c_data - Reads the I2C SDA data bit
 * @hw: pointer to hardware structure
 * @i2cctl: Current value of I2CCTL register
 *
 * Returns the I2C data bit value
 */
static bool
ixgbe_get_i2c_data(u32 *i2cctl)
{
	bool data;

	DEBUGFUNC("ixgbe_get_i2c_data");

	if (*i2cctl & IXGBE_I2C_DATA_IN)
		data = 1;
	else
		data = 0;

	return (data);
}

/*
 * ixgbe_i2c_bus_clear - Clears the I2C bus
 * @hw: pointer to hardware structure
 *
 * Clears the I2C bus by sending nine clock pulses.
 * Used when data line is stuck low.
 */
void
ixgbe_i2c_bus_clear(struct ixgbe_hw *hw)
{
	u32 i2cctl = IXGBE_READ_REG(hw, IXGBE_I2CCTL);
	u32 i;

	DEBUGFUNC("ixgbe_i2c_bus_clear");

	ixgbe_i2c_start(hw);

	(void) ixgbe_set_i2c_data(hw, &i2cctl, 1);

	for (i = 0; i < 9; i++) {
		(void) ixgbe_raise_i2c_clk(hw, &i2cctl);

		/* Min high period of clock is 4us */
		usec_delay(IXGBE_I2C_T_HIGH);

		ixgbe_lower_i2c_clk(hw, &i2cctl);

		/* Min low period of clock is 4.7us */
		usec_delay(IXGBE_I2C_T_LOW);
	}

	ixgbe_i2c_start(hw);

	/* Put the i2c bus back to default state */
	ixgbe_i2c_stop(hw);
}