/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2001 - 2015 Intel Corporation
 */

/*
 * 82575EB Gigabit Network Connection
 * 82575EB Gigabit Backplane Connection
 * 82575GB Gigabit Network Connection
 * 82576 Gigabit Network Connection
 * 82576 Quad Port Gigabit Mezzanine Adapter
 * 82580 Gigabit Network Connection
 * I350 Gigabit Network Connection
 */

#include "e1000_api.h"
#include "e1000_i210.h"

STATIC s32  e1000_init_phy_params_82575(struct e1000_hw *hw);
STATIC s32  e1000_init_mac_params_82575(struct e1000_hw *hw);
STATIC s32  e1000_acquire_phy_82575(struct e1000_hw *hw);
STATIC void e1000_release_phy_82575(struct e1000_hw *hw);
STATIC s32  e1000_acquire_nvm_82575(struct e1000_hw *hw);
STATIC void e1000_release_nvm_82575(struct e1000_hw *hw);
STATIC s32  e1000_check_for_link_82575(struct e1000_hw *hw);
STATIC s32  e1000_check_for_link_media_swap(struct e1000_hw *hw);
STATIC s32  e1000_get_cfg_done_82575(struct e1000_hw *hw);
STATIC s32  e1000_get_link_up_info_82575(struct e1000_hw *hw, u16 *speed,
					 u16 *duplex);
STATIC s32  e1000_phy_hw_reset_sgmii_82575(struct e1000_hw *hw);
STATIC s32  e1000_read_phy_reg_sgmii_82575(struct e1000_hw *hw, u32 offset,
					   u16 *data);
STATIC s32  e1000_reset_hw_82575(struct e1000_hw *hw);
STATIC s32  e1000_reset_hw_82580(struct e1000_hw *hw);
STATIC s32  e1000_read_phy_reg_82580(struct e1000_hw *hw,
				     u32 offset, u16 *data);
STATIC s32  e1000_write_phy_reg_82580(struct e1000_hw *hw,
				      u32 offset, u16 data);
STATIC s32  e1000_set_d0_lplu_state_82580(struct e1000_hw *hw,
					  bool active);
STATIC s32  e1000_set_d3_lplu_state_82580(struct e1000_hw *hw,
					  bool active);
STATIC s32  e1000_set_d0_lplu_state_82575(struct e1000_hw *hw,
					  bool active);
STATIC s32  e1000_setup_copper_link_82575(struct e1000_hw *hw);
STATIC s32  e1000_setup_serdes_link_82575(struct e1000_hw *hw);
STATIC s32  e1000_get_media_type_82575(struct e1000_hw *hw);
STATIC s32  e1000_set_sfp_media_type_82575(struct e1000_hw *hw);
STATIC s32  e1000_valid_led_default_82575(struct e1000_hw *hw, u16 *data);
STATIC s32  e1000_write_phy_reg_sgmii_82575(struct e1000_hw *hw,
					    u32 offset, u16 data);
STATIC void e1000_clear_hw_cntrs_82575(struct e1000_hw *hw);
STATIC s32  e1000_acquire_swfw_sync_82575(struct e1000_hw *hw, u16 mask);
STATIC s32  e1000_get_pcs_speed_and_duplex_82575(struct e1000_hw *hw,
						 u16 *speed, u16 *duplex);
STATIC s32  e1000_get_phy_id_82575(struct e1000_hw *hw);
STATIC void e1000_release_swfw_sync_82575(struct e1000_hw *hw, u16 mask);
STATIC bool e1000_sgmii_active_82575(struct e1000_hw *hw);
STATIC s32  e1000_reset_init_script_82575(struct e1000_hw *hw);
STATIC s32  e1000_read_mac_addr_82575(struct e1000_hw *hw);
STATIC void e1000_config_collision_dist_82575(struct e1000_hw *hw);
STATIC void e1000_power_down_phy_copper_82575(struct e1000_hw *hw);
STATIC void e1000_shutdown_serdes_link_82575(struct e1000_hw *hw);
STATIC void e1000_power_up_serdes_link_82575(struct e1000_hw *hw);
STATIC s32 e1000_set_pcie_completion_timeout(struct e1000_hw *hw);
STATIC s32 e1000_reset_mdicnfg_82580(struct e1000_hw *hw);
STATIC s32 e1000_validate_nvm_checksum_82580(struct e1000_hw *hw);
STATIC s32 e1000_update_nvm_checksum_82580(struct e1000_hw *hw);
STATIC s32 e1000_update_nvm_checksum_with_offset(struct e1000_hw *hw,
						 u16 offset);
STATIC s32 e1000_validate_nvm_checksum_with_offset(struct e1000_hw *hw,
						   u16 offset);
STATIC s32 e1000_validate_nvm_checksum_i350(struct e1000_hw *hw);
STATIC s32 e1000_update_nvm_checksum_i350(struct e1000_hw *hw);
STATIC void e1000_clear_vfta_i350(struct e1000_hw *hw);

STATIC void e1000_i2c_start(struct e1000_hw *hw);
STATIC void e1000_i2c_stop(struct e1000_hw *hw);
STATIC s32 e1000_clock_in_i2c_byte(struct e1000_hw *hw, u8 *data);
STATIC s32 e1000_clock_out_i2c_byte(struct e1000_hw *hw, u8 data);
STATIC s32 e1000_get_i2c_ack(struct e1000_hw *hw);
STATIC s32 e1000_clock_in_i2c_bit(struct e1000_hw *hw, bool *data);
STATIC s32 e1000_clock_out_i2c_bit(struct e1000_hw *hw, bool data);
STATIC void e1000_raise_i2c_clk(struct e1000_hw *hw, u32 *i2cctl);
STATIC void e1000_lower_i2c_clk(struct e1000_hw *hw, u32 *i2cctl);
STATIC s32 e1000_set_i2c_data(struct e1000_hw *hw, u32 *i2cctl, bool data);
STATIC bool e1000_get_i2c_data(u32 *i2cctl);

STATIC const u16 e1000_82580_rxpbs_table[] = {
	36, 72, 144, 1, 2, 4, 8, 16, 35, 70, 140 };
#define E1000_82580_RXPBS_TABLE_SIZE \
	(sizeof(e1000_82580_rxpbs_table) / \
	 sizeof(e1000_82580_rxpbs_table[0]))


/**
 *  e1000_sgmii_uses_mdio_82575 - Determine if I2C pins are for external MDIO
 *  @hw: pointer to the HW structure
 *
 *  Called to determine if the I2C pins are being used for I2C or as an
 *  external MDIO interface since the two options are mutually exclusive.
 **/
STATIC bool e1000_sgmii_uses_mdio_82575(struct e1000_hw *hw)
{
	u32 reg = 0;
	bool ext_mdio = false;

	DEBUGFUNC("e1000_sgmii_uses_mdio_82575");

	switch (hw->mac.type) {
	case e1000_82575:
	case e1000_82576:
		reg = E1000_READ_REG(hw, E1000_MDIC);
		ext_mdio = !!(reg & E1000_MDIC_DEST);
		break;
	case e1000_82580:
	case e1000_i350:
	case e1000_i354:
	case e1000_i210:
	case e1000_i211:
		reg = E1000_READ_REG(hw, E1000_MDICNFG);
		ext_mdio = !!(reg & E1000_MDICNFG_EXT_MDIO);
		break;
	default:
		break;
	}
	return ext_mdio;
}

/**
 *  e1000_init_phy_params_82575 - Init PHY func ptrs.
 *  @hw: pointer to the HW structure
 **/
STATIC s32 e1000_init_phy_params_82575(struct e1000_hw *hw)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32 ret_val = E1000_SUCCESS;
	u32 ctrl_ext;

	DEBUGFUNC("e1000_init_phy_params_82575");

	phy->ops.read_i2c_byte = e1000_read_i2c_byte_generic;
	phy->ops.write_i2c_byte = e1000_write_i2c_byte_generic;

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

	phy->ops.power_up   = e1000_power_up_phy_copper;
	phy->ops.power_down = e1000_power_down_phy_copper_82575;

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

	phy->ops.acquire	= e1000_acquire_phy_82575;
	phy->ops.check_reset_block = e1000_check_reset_block_generic;
	phy->ops.commit		= e1000_phy_sw_reset_generic;
	phy->ops.get_cfg_done	= e1000_get_cfg_done_82575;
	phy->ops.release	= e1000_release_phy_82575;

	ctrl_ext = E1000_READ_REG(hw, E1000_CTRL_EXT);

	if (e1000_sgmii_active_82575(hw)) {
		phy->ops.reset = e1000_phy_hw_reset_sgmii_82575;
		ctrl_ext |= E1000_CTRL_I2C_ENA;
	} else {
		phy->ops.reset = e1000_phy_hw_reset_generic;
		ctrl_ext &= ~E1000_CTRL_I2C_ENA;
	}

	E1000_WRITE_REG(hw, E1000_CTRL_EXT, ctrl_ext);
	e1000_reset_mdicnfg_82580(hw);

	if (e1000_sgmii_active_82575(hw) && !e1000_sgmii_uses_mdio_82575(hw)) {
		phy->ops.read_reg = e1000_read_phy_reg_sgmii_82575;
		phy->ops.write_reg = e1000_write_phy_reg_sgmii_82575;
	} else {
		switch (hw->mac.type) {
		case e1000_82580:
		case e1000_i350:
		case e1000_i354:
			phy->ops.read_reg = e1000_read_phy_reg_82580;
			phy->ops.write_reg = e1000_write_phy_reg_82580;
			break;
		case e1000_i210:
		case e1000_i211:
			phy->ops.read_reg = e1000_read_phy_reg_gs40g;
			phy->ops.write_reg = e1000_write_phy_reg_gs40g;
			break;
		default:
			phy->ops.read_reg = e1000_read_phy_reg_igp;
			phy->ops.write_reg = e1000_write_phy_reg_igp;
		}
	}

	/* Set phy->phy_addr and phy->id. */
	ret_val = e1000_get_phy_id_82575(hw);

	/* Verify phy id and set remaining function pointers */
	switch (phy->id) {
	case M88E1543_E_PHY_ID:
	case M88E1512_E_PHY_ID:
	case I347AT4_E_PHY_ID:
	case M88E1112_E_PHY_ID:
	case M88E1340M_E_PHY_ID:
	case M88E1111_I_PHY_ID:
		phy->type		= e1000_phy_m88;
		phy->ops.check_polarity	= e1000_check_polarity_m88;
		phy->ops.get_info	= e1000_get_phy_info_m88;
		if (phy->id == I347AT4_E_PHY_ID ||
		    phy->id == M88E1112_E_PHY_ID ||
		    phy->id == M88E1340M_E_PHY_ID)
			phy->ops.get_cable_length =
					 e1000_get_cable_length_m88_gen2;
		else if (phy->id == M88E1543_E_PHY_ID ||
			 phy->id == M88E1512_E_PHY_ID)
			phy->ops.get_cable_length =
					 e1000_get_cable_length_m88_gen2;
		else
			phy->ops.get_cable_length = e1000_get_cable_length_m88;
		phy->ops.force_speed_duplex = e1000_phy_force_speed_duplex_m88;
		/* Check if this PHY is confgured for media swap. */
		if (phy->id == M88E1112_E_PHY_ID) {
			u16 data;

			ret_val = phy->ops.write_reg(hw,
						     E1000_M88E1112_PAGE_ADDR,
						     2);
			if (ret_val)
				goto out;

			ret_val = phy->ops.read_reg(hw,
						    E1000_M88E1112_MAC_CTRL_1,
						    &data);
			if (ret_val)
				goto out;

			data = (data & E1000_M88E1112_MAC_CTRL_1_MODE_MASK) >>
			       E1000_M88E1112_MAC_CTRL_1_MODE_SHIFT;
			if (data == E1000_M88E1112_AUTO_COPPER_SGMII ||
			    data == E1000_M88E1112_AUTO_COPPER_BASEX)
				hw->mac.ops.check_for_link =
						e1000_check_for_link_media_swap;
		}
		if (phy->id == M88E1512_E_PHY_ID) {
			ret_val = e1000_initialize_M88E1512_phy(hw);
			if (ret_val)
				goto out;
		}
		if (phy->id == M88E1543_E_PHY_ID) {
			ret_val = e1000_initialize_M88E1543_phy(hw);
			if (ret_val)
				goto out;
		}
		break;
	case IGP03E1000_E_PHY_ID:
	case IGP04E1000_E_PHY_ID:
		phy->type = e1000_phy_igp_3;
		phy->ops.check_polarity = e1000_check_polarity_igp;
		phy->ops.get_info = e1000_get_phy_info_igp;
		phy->ops.get_cable_length = e1000_get_cable_length_igp_2;
		phy->ops.force_speed_duplex = e1000_phy_force_speed_duplex_igp;
		phy->ops.set_d0_lplu_state = e1000_set_d0_lplu_state_82575;
		phy->ops.set_d3_lplu_state = e1000_set_d3_lplu_state_generic;
		break;
	case I82580_I_PHY_ID:
	case I350_I_PHY_ID:
		phy->type = e1000_phy_82580;
		phy->ops.check_polarity = e1000_check_polarity_82577;
		phy->ops.force_speed_duplex =
					 e1000_phy_force_speed_duplex_82577;
		phy->ops.get_cable_length = e1000_get_cable_length_82577;
		phy->ops.get_info = e1000_get_phy_info_82577;
		phy->ops.set_d0_lplu_state = e1000_set_d0_lplu_state_82580;
		phy->ops.set_d3_lplu_state = e1000_set_d3_lplu_state_82580;
		break;
	case I210_I_PHY_ID:
		phy->type		= e1000_phy_i210;
		phy->ops.check_polarity	= e1000_check_polarity_m88;
		phy->ops.get_info	= e1000_get_phy_info_m88;
		phy->ops.get_cable_length = e1000_get_cable_length_m88_gen2;
		phy->ops.set_d0_lplu_state = e1000_set_d0_lplu_state_82580;
		phy->ops.set_d3_lplu_state = e1000_set_d3_lplu_state_82580;
		phy->ops.force_speed_duplex = e1000_phy_force_speed_duplex_m88;
		break;
	case BCM54616_E_PHY_ID:
		phy->type		= e1000_phy_none;
		break;
	default:
		ret_val = -E1000_ERR_PHY;
		goto out;
	}

out:
	return ret_val;
}

/**
 *  e1000_init_nvm_params_82575 - Init NVM func ptrs.
 *  @hw: pointer to the HW structure
 **/
s32 e1000_init_nvm_params_82575(struct e1000_hw *hw)
{
	struct e1000_nvm_info *nvm = &hw->nvm;
	u32 eecd = E1000_READ_REG(hw, E1000_EECD);
	u16 size;

	DEBUGFUNC("e1000_init_nvm_params_82575");

	size = (u16)((eecd & E1000_EECD_SIZE_EX_MASK) >>
		     E1000_EECD_SIZE_EX_SHIFT);
	/*
	 * Added to a constant, "size" becomes the left-shift value
	 * for setting word_size.
	 */
	size += NVM_WORD_SIZE_BASE_SHIFT;

	/* Just in case size is out of range, cap it to the largest
	 * EEPROM size supported
	 */
	if (size > 15)
		size = 15;

	nvm->word_size = 1 << size;
	if (hw->mac.type < e1000_i210) {
		nvm->opcode_bits = 8;
		nvm->delay_usec = 1;

		switch (nvm->override) {
		case e1000_nvm_override_spi_large:
			nvm->page_size = 32;
			nvm->address_bits = 16;
			break;
		case e1000_nvm_override_spi_small:
			nvm->page_size = 8;
			nvm->address_bits = 8;
			break;
		default:
			nvm->page_size = eecd & E1000_EECD_ADDR_BITS ? 32 : 8;
			nvm->address_bits = eecd & E1000_EECD_ADDR_BITS ?
					    16 : 8;
			break;
		}
		if (nvm->word_size == (1 << 15))
			nvm->page_size = 128;

		nvm->type = e1000_nvm_eeprom_spi;
	} else {
		nvm->type = e1000_nvm_flash_hw;
	}

	/* Function Pointers */
	nvm->ops.acquire = e1000_acquire_nvm_82575;
	nvm->ops.release = e1000_release_nvm_82575;
	if (nvm->word_size < (1 << 15))
		nvm->ops.read = e1000_read_nvm_eerd;
	else
		nvm->ops.read = e1000_read_nvm_spi;

	nvm->ops.write = e1000_write_nvm_spi;
	nvm->ops.validate = e1000_validate_nvm_checksum_generic;
	nvm->ops.update = e1000_update_nvm_checksum_generic;
	nvm->ops.valid_led_default = e1000_valid_led_default_82575;

	/* override generic family function pointers for specific descendants */
	switch (hw->mac.type) {
	case e1000_82580:
		nvm->ops.validate = e1000_validate_nvm_checksum_82580;
		nvm->ops.update = e1000_update_nvm_checksum_82580;
		break;
	case e1000_i350:
	case e1000_i354:
		nvm->ops.validate = e1000_validate_nvm_checksum_i350;
		nvm->ops.update = e1000_update_nvm_checksum_i350;
		break;
	default:
		break;
	}

	return E1000_SUCCESS;
}

/**
 *  e1000_init_mac_params_82575 - Init MAC func ptrs.
 *  @hw: pointer to the HW structure
 **/
STATIC s32 e1000_init_mac_params_82575(struct e1000_hw *hw)
{
	struct e1000_mac_info *mac = &hw->mac;
	struct e1000_dev_spec_82575 *dev_spec = &hw->dev_spec._82575;

	DEBUGFUNC("e1000_init_mac_params_82575");

	/* Derives media type */
	e1000_get_media_type_82575(hw);
	/* Set mta register count */
	mac->mta_reg_count = 128;
	/* Set uta register count */
	mac->uta_reg_count = (hw->mac.type == e1000_82575) ? 0 : 128;
	/* Set rar entry count */
	mac->rar_entry_count = E1000_RAR_ENTRIES_82575;
	if (mac->type == e1000_82576)
		mac->rar_entry_count = E1000_RAR_ENTRIES_82576;
	if (mac->type == e1000_82580)
		mac->rar_entry_count = E1000_RAR_ENTRIES_82580;
	if (mac->type == e1000_i350 || mac->type == e1000_i354)
		mac->rar_entry_count = E1000_RAR_ENTRIES_I350;

	/* Enable EEE default settings for EEE supported devices */
	if (mac->type >= e1000_i350)
		dev_spec->eee_disable = false;

	/* Allow a single clear of the SW semaphore on I210 and newer */
	if (mac->type >= e1000_i210)
		dev_spec->clear_semaphore_once = true;

	/* Set if part includes ASF firmware */
	mac->asf_firmware_present = true;
	/* FWSM register */
	mac->has_fwsm = true;
	/* ARC supported; valid only if manageability features are enabled. */
	mac->arc_subsystem_valid =
		!!(E1000_READ_REG(hw, E1000_FWSM) & E1000_FWSM_MODE_MASK);

	/* Function pointers */

	/* bus type/speed/width */
	mac->ops.get_bus_info = e1000_get_bus_info_pcie_generic;
	/* reset */
	if (mac->type >= e1000_82580)
		mac->ops.reset_hw = e1000_reset_hw_82580;
	else
	mac->ops.reset_hw = e1000_reset_hw_82575;
	/* hw initialization */
	if ((mac->type == e1000_i210) || (mac->type == e1000_i211))
		mac->ops.init_hw = e1000_init_hw_i210;
	else
	mac->ops.init_hw = e1000_init_hw_82575;
	/* link setup */
	mac->ops.setup_link = e1000_setup_link_generic;
	/* physical interface link setup */
	mac->ops.setup_physical_interface =
		(hw->phy.media_type == e1000_media_type_copper)
		? e1000_setup_copper_link_82575 : e1000_setup_serdes_link_82575;
	/* physical interface shutdown */
	mac->ops.shutdown_serdes = e1000_shutdown_serdes_link_82575;
	/* physical interface power up */
	mac->ops.power_up_serdes = e1000_power_up_serdes_link_82575;
	/* check for link */
	mac->ops.check_for_link = e1000_check_for_link_82575;
	/* read mac address */
	mac->ops.read_mac_addr = e1000_read_mac_addr_82575;
	/* configure collision distance */
	mac->ops.config_collision_dist = e1000_config_collision_dist_82575;
	/* multicast address update */
	mac->ops.update_mc_addr_list = e1000_update_mc_addr_list_generic;
	if (hw->mac.type == e1000_i350 || mac->type == e1000_i354) {
		/* writing VFTA */
		mac->ops.write_vfta = e1000_write_vfta_i350;
		/* clearing VFTA */
		mac->ops.clear_vfta = e1000_clear_vfta_i350;
	} else {
		/* writing VFTA */
		mac->ops.write_vfta = e1000_write_vfta_generic;
		/* clearing VFTA */
		mac->ops.clear_vfta = e1000_clear_vfta_generic;
	}
	if (hw->mac.type >= e1000_82580)
		mac->ops.validate_mdi_setting =
				e1000_validate_mdi_setting_crossover_generic;
	/* ID LED init */
	mac->ops.id_led_init = e1000_id_led_init_generic;
	/* blink LED */
	mac->ops.blink_led = e1000_blink_led_generic;
	/* setup LED */
	mac->ops.setup_led = e1000_setup_led_generic;
	/* cleanup LED */
	mac->ops.cleanup_led = e1000_cleanup_led_generic;
	/* turn on/off LED */
	mac->ops.led_on = e1000_led_on_generic;
	mac->ops.led_off = e1000_led_off_generic;
	/* clear hardware counters */
	mac->ops.clear_hw_cntrs = e1000_clear_hw_cntrs_82575;
	/* link info */
	mac->ops.get_link_up_info = e1000_get_link_up_info_82575;
	/* acquire SW_FW sync */
	mac->ops.acquire_swfw_sync = e1000_acquire_swfw_sync_82575;
	mac->ops.release_swfw_sync = e1000_release_swfw_sync_82575;
	if (mac->type >= e1000_i210) {
		mac->ops.acquire_swfw_sync = e1000_acquire_swfw_sync_i210;
		mac->ops.release_swfw_sync = e1000_release_swfw_sync_i210;
	}

	/* set lan id for port to determine which phy lock to use */
	hw->mac.ops.set_lan_id(hw);

	return E1000_SUCCESS;
}

/**
 *  e1000_init_function_pointers_82575 - Init func ptrs.
 *  @hw: pointer to the HW structure
 *
 *  Called to initialize all function pointers and parameters.
 **/
void e1000_init_function_pointers_82575(struct e1000_hw *hw)
{
	DEBUGFUNC("e1000_init_function_pointers_82575");

	hw->mac.ops.init_params = e1000_init_mac_params_82575;
	hw->nvm.ops.init_params = e1000_init_nvm_params_82575;
	hw->phy.ops.init_params = e1000_init_phy_params_82575;
	hw->mbx.ops.init_params = e1000_init_mbx_params_pf;
}

/**
 *  e1000_acquire_phy_82575 - Acquire rights to access PHY
 *  @hw: pointer to the HW structure
 *
 *  Acquire access rights to the correct PHY.
 **/
STATIC s32 e1000_acquire_phy_82575(struct e1000_hw *hw)
{
	u16 mask = E1000_SWFW_PHY0_SM;

	DEBUGFUNC("e1000_acquire_phy_82575");

	if (hw->bus.func == E1000_FUNC_1)
		mask = E1000_SWFW_PHY1_SM;
	else if (hw->bus.func == E1000_FUNC_2)
		mask = E1000_SWFW_PHY2_SM;
	else if (hw->bus.func == E1000_FUNC_3)
		mask = E1000_SWFW_PHY3_SM;

	return hw->mac.ops.acquire_swfw_sync(hw, mask);
}

/**
 *  e1000_release_phy_82575 - Release rights to access PHY
 *  @hw: pointer to the HW structure
 *
 *  A wrapper to release access rights to the correct PHY.
 **/
STATIC void e1000_release_phy_82575(struct e1000_hw *hw)
{
	u16 mask = E1000_SWFW_PHY0_SM;

	DEBUGFUNC("e1000_release_phy_82575");

	if (hw->bus.func == E1000_FUNC_1)
		mask = E1000_SWFW_PHY1_SM;
	else if (hw->bus.func == E1000_FUNC_2)
		mask = E1000_SWFW_PHY2_SM;
	else if (hw->bus.func == E1000_FUNC_3)
		mask = E1000_SWFW_PHY3_SM;

	hw->mac.ops.release_swfw_sync(hw, mask);
}

/**
 *  e1000_read_phy_reg_sgmii_82575 - Read PHY register using sgmii
 *  @hw: pointer to the HW structure
 *  @offset: register offset to be read
 *  @data: pointer to the read data
 *
 *  Reads the PHY register at offset using the serial gigabit media independent
 *  interface and stores the retrieved information in data.
 **/
STATIC s32 e1000_read_phy_reg_sgmii_82575(struct e1000_hw *hw, u32 offset,
					  u16 *data)
{
	s32 ret_val = -E1000_ERR_PARAM;

	DEBUGFUNC("e1000_read_phy_reg_sgmii_82575");

	if (offset > E1000_MAX_SGMII_PHY_REG_ADDR) {
		DEBUGOUT1("PHY Address %u is out of range\n", offset);
		goto out;
	}

	ret_val = hw->phy.ops.acquire(hw);
	if (ret_val)
		goto out;

	ret_val = e1000_read_phy_reg_i2c(hw, offset, data);

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

out:
	return ret_val;
}

/**
 *  e1000_write_phy_reg_sgmii_82575 - Write PHY register using sgmii
 *  @hw: pointer to the HW structure
 *  @offset: register offset to write to
 *  @data: data to write at register offset
 *
 *  Writes the data to PHY register at the offset using the serial gigabit
 *  media independent interface.
 **/
STATIC s32 e1000_write_phy_reg_sgmii_82575(struct e1000_hw *hw, u32 offset,
					   u16 data)
{
	s32 ret_val = -E1000_ERR_PARAM;

	DEBUGFUNC("e1000_write_phy_reg_sgmii_82575");

	if (offset > E1000_MAX_SGMII_PHY_REG_ADDR) {
		DEBUGOUT1("PHY Address %d is out of range\n", offset);
		goto out;
	}

	ret_val = hw->phy.ops.acquire(hw);
	if (ret_val)
		goto out;

	ret_val = e1000_write_phy_reg_i2c(hw, offset, data);

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

out:
	return ret_val;
}

/**
 *  e1000_get_phy_id_82575 - Retrieve PHY addr and id
 *  @hw: pointer to the HW structure
 *
 *  Retrieves the PHY address and ID for both PHY's which do and do not use
 *  sgmi interface.
 **/
STATIC s32 e1000_get_phy_id_82575(struct e1000_hw *hw)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32  ret_val = E1000_SUCCESS;
	u16 phy_id;
	u32 ctrl_ext;
	u32 mdic;

	DEBUGFUNC("e1000_get_phy_id_82575");

	/* some i354 devices need an extra read for phy id */
	if (hw->mac.type == e1000_i354)
		e1000_get_phy_id(hw);

	/*
	 * For SGMII PHYs, we try the list of possible addresses until
	 * we find one that works.  For non-SGMII PHYs
	 * (e.g. integrated copper PHYs), an address of 1 should
	 * work.  The result of this function should mean phy->phy_addr
	 * and phy->id are set correctly.
	 */
	if (!e1000_sgmii_active_82575(hw)) {
		phy->addr = 1;
		ret_val = e1000_get_phy_id(hw);
		goto out;
	}

	if (e1000_sgmii_uses_mdio_82575(hw)) {
		switch (hw->mac.type) {
		case e1000_82575:
		case e1000_82576:
			mdic = E1000_READ_REG(hw, E1000_MDIC);
			mdic &= E1000_MDIC_PHY_MASK;
			phy->addr = mdic >> E1000_MDIC_PHY_SHIFT;
			break;
		case e1000_82580:
		case e1000_i350:
		case e1000_i354:
		case e1000_i210:
		case e1000_i211:
			mdic = E1000_READ_REG(hw, E1000_MDICNFG);
			mdic &= E1000_MDICNFG_PHY_MASK;
			phy->addr = mdic >> E1000_MDICNFG_PHY_SHIFT;
			break;
		default:
			ret_val = -E1000_ERR_PHY;
			goto out;
			break;
		}
		ret_val = e1000_get_phy_id(hw);
		goto out;
	}

	/* Power on sgmii phy if it is disabled */
	ctrl_ext = E1000_READ_REG(hw, E1000_CTRL_EXT);
	E1000_WRITE_REG(hw, E1000_CTRL_EXT,
			ctrl_ext & ~E1000_CTRL_EXT_SDP3_DATA);
	E1000_WRITE_FLUSH(hw);
	msec_delay(300);

	/*
	 * The address field in the I2CCMD register is 3 bits and 0 is invalid.
	 * Therefore, we need to test 1-7
	 */
	for (phy->addr = 1; phy->addr < 8; phy->addr++) {
		ret_val = e1000_read_phy_reg_sgmii_82575(hw, PHY_ID1, &phy_id);
		if (ret_val == E1000_SUCCESS) {
			DEBUGOUT2("Vendor ID 0x%08X read at address %u\n",
				  phy_id, phy->addr);
			/*
			 * At the time of this writing, The M88 part is
			 * the only supported SGMII PHY product.
			 */
			if (phy_id == M88_VENDOR)
				break;
		} else {
			DEBUGOUT1("PHY address %u was unreadable\n",
				  phy->addr);
		}
	}

	/* A valid PHY type couldn't be found. */
	if (phy->addr == 8) {
		phy->addr = 0;
		ret_val = -E1000_ERR_PHY;
	} else {
		ret_val = e1000_get_phy_id(hw);
	}

	/* restore previous sfp cage power state */
	E1000_WRITE_REG(hw, E1000_CTRL_EXT, ctrl_ext);

out:
	return ret_val;
}

/**
 *  e1000_phy_hw_reset_sgmii_82575 - Performs a PHY reset
 *  @hw: pointer to the HW structure
 *
 *  Resets the PHY using the serial gigabit media independent interface.
 **/
STATIC s32 e1000_phy_hw_reset_sgmii_82575(struct e1000_hw *hw)
{
	s32 ret_val = E1000_SUCCESS;
	struct e1000_phy_info *phy = &hw->phy;

	DEBUGFUNC("e1000_phy_hw_reset_sgmii_82575");

	/*
	 * This isn't a true "hard" reset, but is the only reset
	 * available to us at this time.
	 */

	DEBUGOUT("Soft resetting SGMII attached PHY...\n");

	if (!(hw->phy.ops.write_reg))
		goto out;

	/*
	 * SFP documentation requires the following to configure the SPF module
	 * to work on SGMII.  No further documentation is given.
	 */
	ret_val = hw->phy.ops.write_reg(hw, 0x1B, 0x8084);
	if (ret_val)
		goto out;

	ret_val = hw->phy.ops.commit(hw);
	if (ret_val)
		goto out;

	if (phy->id == M88E1512_E_PHY_ID)
		ret_val = e1000_initialize_M88E1512_phy(hw);
out:
	return ret_val;
}

/**
 *  e1000_set_d0_lplu_state_82575 - Set Low Power Linkup D0 state
 *  @hw: pointer to the HW structure
 *  @active: true to enable LPLU, false to disable
 *
 *  Sets the LPLU D0 state according to the active flag.  When
 *  activating LPLU this function also disables smart speed
 *  and vice versa.  LPLU will not be activated unless the
 *  device autonegotiation advertisement meets standards of
 *  either 10 or 10/100 or 10/100/1000 at all duplexes.
 *  This is a function pointer entry point only called by
 *  PHY setup routines.
 **/
STATIC s32 e1000_set_d0_lplu_state_82575(struct e1000_hw *hw, bool active)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32 ret_val = E1000_SUCCESS;
	u16 data;

	DEBUGFUNC("e1000_set_d0_lplu_state_82575");

	if (!(hw->phy.ops.read_reg))
		goto out;

	ret_val = phy->ops.read_reg(hw, IGP02E1000_PHY_POWER_MGMT, &data);
	if (ret_val)
		goto out;

	if (active) {
		data |= IGP02E1000_PM_D0_LPLU;
		ret_val = phy->ops.write_reg(hw, IGP02E1000_PHY_POWER_MGMT,
					     data);
		if (ret_val)
			goto out;

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

			data |= IGP01E1000_PSCFR_SMART_SPEED;
			ret_val = phy->ops.write_reg(hw,
						     IGP01E1000_PHY_PORT_CONFIG,
						     data);
			if (ret_val)
				goto out;
		} else if (phy->smart_speed == e1000_smart_speed_off) {
			ret_val = phy->ops.read_reg(hw,
						    IGP01E1000_PHY_PORT_CONFIG,
						    &data);
			if (ret_val)
				goto out;

			data &= ~IGP01E1000_PSCFR_SMART_SPEED;
			ret_val = phy->ops.write_reg(hw,
						     IGP01E1000_PHY_PORT_CONFIG,
						     data);
			if (ret_val)
				goto out;
		}
	}

out:
	return ret_val;
}

/**
 *  e1000_set_d0_lplu_state_82580 - Set Low Power Linkup D0 state
 *  @hw: pointer to the HW structure
 *  @active: true to enable LPLU, false to disable
 *
 *  Sets the LPLU D0 state according to the active flag.  When
 *  activating LPLU this function also disables smart speed
 *  and vice versa.  LPLU will not be activated unless the
 *  device autonegotiation advertisement meets standards of
 *  either 10 or 10/100 or 10/100/1000 at all duplexes.
 *  This is a function pointer entry point only called by
 *  PHY setup routines.
 **/
STATIC s32 e1000_set_d0_lplu_state_82580(struct e1000_hw *hw, bool active)
{
	struct e1000_phy_info *phy = &hw->phy;
	u32 data;

	DEBUGFUNC("e1000_set_d0_lplu_state_82580");

	data = E1000_READ_REG(hw, E1000_82580_PHY_POWER_MGMT);

	if (active) {
		data |= E1000_82580_PM_D0_LPLU;

		/* When LPLU is enabled, we should disable SmartSpeed */
		data &= ~E1000_82580_PM_SPD;
	} else {
		data &= ~E1000_82580_PM_D0_LPLU;

		/*
		 * LPLU and SmartSpeed are mutually exclusive.  LPLU is used
		 * during Dx states where the power conservation is most
		 * important.  During driver activity we should enable
		 * SmartSpeed, so performance is maintained.
		 */
		if (phy->smart_speed == e1000_smart_speed_on)
			data |= E1000_82580_PM_SPD;
		else if (phy->smart_speed == e1000_smart_speed_off)
			data &= ~E1000_82580_PM_SPD;
	}

	E1000_WRITE_REG(hw, E1000_82580_PHY_POWER_MGMT, data);
	return E1000_SUCCESS;
}

/**
 *  e1000_set_d3_lplu_state_82580 - Sets low power link up state for D3
 *  @hw: pointer to the HW structure
 *  @active: boolean used to enable/disable lplu
 *
 *  Success returns 0, Failure returns 1
 *
 *  The low power link up (lplu) state is set to the power management level D3
 *  and SmartSpeed is disabled when active is true, else clear lplu for D3
 *  and enable Smartspeed.  LPLU and Smartspeed are mutually exclusive.  LPLU
 *  is used during Dx states where the power conservation is most important.
 *  During driver activity, SmartSpeed should be enabled so performance is
 *  maintained.
 **/
s32 e1000_set_d3_lplu_state_82580(struct e1000_hw *hw, bool active)
{
	struct e1000_phy_info *phy = &hw->phy;
	u32 data;

	DEBUGFUNC("e1000_set_d3_lplu_state_82580");

	data = E1000_READ_REG(hw, E1000_82580_PHY_POWER_MGMT);

	if (!active) {
		data &= ~E1000_82580_PM_D3_LPLU;
		/*
		 * LPLU and SmartSpeed are mutually exclusive.  LPLU is used
		 * during Dx states where the power conservation is most
		 * important.  During driver activity we should enable
		 * SmartSpeed, so performance is maintained.
		 */
		if (phy->smart_speed == e1000_smart_speed_on)
			data |= E1000_82580_PM_SPD;
		else if (phy->smart_speed == e1000_smart_speed_off)
			data &= ~E1000_82580_PM_SPD;
	} else if ((phy->autoneg_advertised == E1000_ALL_SPEED_DUPLEX) ||
		   (phy->autoneg_advertised == E1000_ALL_NOT_GIG) ||
		   (phy->autoneg_advertised == E1000_ALL_10_SPEED)) {
		data |= E1000_82580_PM_D3_LPLU;
		/* When LPLU is enabled, we should disable SmartSpeed */
		data &= ~E1000_82580_PM_SPD;
	}

	E1000_WRITE_REG(hw, E1000_82580_PHY_POWER_MGMT, data);
	return E1000_SUCCESS;
}

/**
 *  e1000_acquire_nvm_82575 - 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 e1000_acquire_nvm_82575(struct e1000_hw *hw)
{
	s32 ret_val = E1000_SUCCESS;

	DEBUGFUNC("e1000_acquire_nvm_82575");

	ret_val = e1000_acquire_swfw_sync_82575(hw, E1000_SWFW_EEP_SM);
	if (ret_val)
		goto out;

	/*
	 * Check if there is some access
	 * error this access may hook on
	 */
	if (hw->mac.type == e1000_i350) {
		u32 eecd = E1000_READ_REG(hw, E1000_EECD);
		if (eecd & (E1000_EECD_BLOCKED | E1000_EECD_ABORT |
		    E1000_EECD_TIMEOUT)) {
			/* Clear all access error flags */
			E1000_WRITE_REG(hw, E1000_EECD, eecd |
					E1000_EECD_ERROR_CLR);
			DEBUGOUT("Nvm bit banging access error detected and cleared.\n");
		}
	}

	if (hw->mac.type == e1000_82580) {
		u32 eecd = E1000_READ_REG(hw, E1000_EECD);
		if (eecd & E1000_EECD_BLOCKED) {
			/* Clear access error flag */
			E1000_WRITE_REG(hw, E1000_EECD, eecd |
					E1000_EECD_BLOCKED);
			DEBUGOUT("Nvm bit banging access error detected and cleared.\n");
		}
	}

	ret_val = e1000_acquire_nvm_generic(hw);
	if (ret_val)
		e1000_release_swfw_sync_82575(hw, E1000_SWFW_EEP_SM);

out:
	return ret_val;
}

/**
 *  e1000_release_nvm_82575 - 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 e1000_release_nvm_82575(struct e1000_hw *hw)
{
	DEBUGFUNC("e1000_release_nvm_82575");

	e1000_release_nvm_generic(hw);

	e1000_release_swfw_sync_82575(hw, E1000_SWFW_EEP_SM);
}

/**
 *  e1000_acquire_swfw_sync_82575 - 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.
 **/
STATIC s32 e1000_acquire_swfw_sync_82575(struct e1000_hw *hw, u16 mask)
{
	u32 swfw_sync;
	u32 swmask = mask;
	u32 fwmask = mask << 16;
	s32 ret_val = E1000_SUCCESS;
	s32 i = 0, timeout = 200;

	DEBUGFUNC("e1000_acquire_swfw_sync_82575");

	while (i < timeout) {
		if (e1000_get_hw_semaphore_generic(hw)) {
			ret_val = -E1000_ERR_SWFW_SYNC;
			goto out;
		}

		swfw_sync = E1000_READ_REG(hw, E1000_SW_FW_SYNC);
		if (!(swfw_sync & (fwmask | swmask)))
			break;

		/*
		 * Firmware currently using resource (fwmask)
		 * or other software thread using resource (swmask)
		 */
		e1000_put_hw_semaphore_generic(hw);
		msec_delay_irq(5);
		i++;
	}

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

	swfw_sync |= swmask;
	E1000_WRITE_REG(hw, E1000_SW_FW_SYNC, swfw_sync);

	e1000_put_hw_semaphore_generic(hw);

out:
	return ret_val;
}

/**
 *  e1000_release_swfw_sync_82575 - 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.
 **/
STATIC void e1000_release_swfw_sync_82575(struct e1000_hw *hw, u16 mask)
{
	u32 swfw_sync;

	DEBUGFUNC("e1000_release_swfw_sync_82575");

	while (e1000_get_hw_semaphore_generic(hw) != E1000_SUCCESS)
		; /* Empty */

	swfw_sync = E1000_READ_REG(hw, E1000_SW_FW_SYNC);
	swfw_sync &= ~mask;
	E1000_WRITE_REG(hw, E1000_SW_FW_SYNC, swfw_sync);

	e1000_put_hw_semaphore_generic(hw);
}

/**
 *  e1000_get_cfg_done_82575 - 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
 *  E1000_SUCCESS.  If we were to return with error, EEPROM-less silicon
 *  would not be able to be reset or change link.
 **/
STATIC s32 e1000_get_cfg_done_82575(struct e1000_hw *hw)
{
	s32 timeout = PHY_CFG_TIMEOUT;
	u32 mask = E1000_NVM_CFG_DONE_PORT_0;

	DEBUGFUNC("e1000_get_cfg_done_82575");

	if (hw->bus.func == E1000_FUNC_1)
		mask = E1000_NVM_CFG_DONE_PORT_1;
	else if (hw->bus.func == E1000_FUNC_2)
		mask = E1000_NVM_CFG_DONE_PORT_2;
	else if (hw->bus.func == E1000_FUNC_3)
		mask = E1000_NVM_CFG_DONE_PORT_3;
	while (timeout) {
		if (E1000_READ_REG(hw, E1000_EEMNGCTL) & mask)
			break;
		msec_delay(1);
		timeout--;
	}
	if (!timeout)
		DEBUGOUT("MNG configuration cycle has not completed.\n");

	/* If EEPROM is not marked present, init the PHY manually */
	if (!(E1000_READ_REG(hw, E1000_EECD) & E1000_EECD_PRES) &&
	    (hw->phy.type == e1000_phy_igp_3))
		e1000_phy_init_script_igp3(hw);

	return E1000_SUCCESS;
}

/**
 *  e1000_get_link_up_info_82575 - Get link speed/duplex info
 *  @hw: pointer to the HW structure
 *  @speed: stores the current speed
 *  @duplex: stores the current duplex
 *
 *  This is a wrapper function, if using the serial gigabit media independent
 *  interface, use PCS to retrieve the link speed and duplex information.
 *  Otherwise, use the generic function to get the link speed and duplex info.
 **/
STATIC s32 e1000_get_link_up_info_82575(struct e1000_hw *hw, u16 *speed,
					u16 *duplex)
{
	s32 ret_val;

	DEBUGFUNC("e1000_get_link_up_info_82575");

	if (hw->phy.media_type != e1000_media_type_copper)
		ret_val = e1000_get_pcs_speed_and_duplex_82575(hw, speed,
							       duplex);
	else
		ret_val = e1000_get_speed_and_duplex_copper_generic(hw, speed,
								    duplex);

	return ret_val;
}

/**
 *  e1000_check_for_link_82575 - Check for link
 *  @hw: pointer to the HW structure
 *
 *  If sgmii is enabled, then use the pcs register to determine link, otherwise
 *  use the generic interface for determining link.
 **/
STATIC s32 e1000_check_for_link_82575(struct e1000_hw *hw)
{
	s32 ret_val;
	u16 speed, duplex;

	DEBUGFUNC("e1000_check_for_link_82575");

	if (hw->phy.media_type != e1000_media_type_copper) {
		ret_val = e1000_get_pcs_speed_and_duplex_82575(hw, &speed,
							       &duplex);
		/*
		 * Use this flag to determine if link needs to be checked or
		 * not.  If we have link clear the flag so that we do not
		 * continue to check for link.
		 */
		hw->mac.get_link_status = !hw->mac.serdes_has_link;

		/*
		 * Configure Flow Control now that Auto-Neg has completed.
		 * First, we need to restore the desired flow control
		 * settings because we may have had to re-autoneg with a
		 * different link partner.
		 */
		ret_val = e1000_config_fc_after_link_up_generic(hw);
		if (ret_val)
			DEBUGOUT("Error configuring flow control\n");
	} else {
		ret_val = e1000_check_for_copper_link_generic(hw);
	}

	return ret_val;
}

/**
 *  e1000_check_for_link_media_swap - Check which M88E1112 interface linked
 *  @hw: pointer to the HW structure
 *
 *  Poll the M88E1112 interfaces to see which interface achieved link.
 */
STATIC s32 e1000_check_for_link_media_swap(struct e1000_hw *hw)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32 ret_val;
	u16 data;
	u8 port = 0;

	DEBUGFUNC("e1000_check_for_link_media_swap");

	/* Check for copper. */
	ret_val = phy->ops.write_reg(hw, E1000_M88E1112_PAGE_ADDR, 0);
	if (ret_val)
		return ret_val;

	ret_val = phy->ops.read_reg(hw, E1000_M88E1112_STATUS, &data);
	if (ret_val)
		return ret_val;

	if (data & E1000_M88E1112_STATUS_LINK)
		port = E1000_MEDIA_PORT_COPPER;

	/* Check for other. */
	ret_val = phy->ops.write_reg(hw, E1000_M88E1112_PAGE_ADDR, 1);
	if (ret_val)
		return ret_val;

	ret_val = phy->ops.read_reg(hw, E1000_M88E1112_STATUS, &data);
	if (ret_val)
		return ret_val;

	if (data & E1000_M88E1112_STATUS_LINK)
		port = E1000_MEDIA_PORT_OTHER;

	/* Determine if a swap needs to happen. */
	if (port && (hw->dev_spec._82575.media_port != port)) {
		hw->dev_spec._82575.media_port = port;
		hw->dev_spec._82575.media_changed = true;
	}

	if (port == E1000_MEDIA_PORT_COPPER) {
		/* reset page to 0 */
		ret_val = phy->ops.write_reg(hw, E1000_M88E1112_PAGE_ADDR, 0);
		if (ret_val)
			return ret_val;
		e1000_check_for_link_82575(hw);
	} else {
		e1000_check_for_link_82575(hw);
		/* reset page to 0 */
		ret_val = phy->ops.write_reg(hw, E1000_M88E1112_PAGE_ADDR, 0);
		if (ret_val)
			return ret_val;
	}

	return E1000_SUCCESS;
}

/**
 *  e1000_power_up_serdes_link_82575 - Power up the serdes link after shutdown
 *  @hw: pointer to the HW structure
 **/
STATIC void e1000_power_up_serdes_link_82575(struct e1000_hw *hw)
{
	u32 reg;

	DEBUGFUNC("e1000_power_up_serdes_link_82575");

	if ((hw->phy.media_type != e1000_media_type_internal_serdes) &&
	    !e1000_sgmii_active_82575(hw))
		return;

	/* Enable PCS to turn on link */
	reg = E1000_READ_REG(hw, E1000_PCS_CFG0);
	reg |= E1000_PCS_CFG_PCS_EN;
	E1000_WRITE_REG(hw, E1000_PCS_CFG0, reg);

	/* Power up the laser */
	reg = E1000_READ_REG(hw, E1000_CTRL_EXT);
	reg &= ~E1000_CTRL_EXT_SDP3_DATA;
	E1000_WRITE_REG(hw, E1000_CTRL_EXT, reg);

	/* flush the write to verify completion */
	E1000_WRITE_FLUSH(hw);
	msec_delay(1);
}

/**
 *  e1000_get_pcs_speed_and_duplex_82575 - Retrieve current speed/duplex
 *  @hw: pointer to the HW structure
 *  @speed: stores the current speed
 *  @duplex: stores the current duplex
 *
 *  Using the physical coding sub-layer (PCS), retrieve the current speed and
 *  duplex, then store the values in the pointers provided.
 **/
STATIC s32 e1000_get_pcs_speed_and_duplex_82575(struct e1000_hw *hw,
						u16 *speed, u16 *duplex)
{
	struct e1000_mac_info *mac = &hw->mac;
	u32 pcs;
	u32 status;

	DEBUGFUNC("e1000_get_pcs_speed_and_duplex_82575");

	/*
	 * Read the PCS Status register for link state. For non-copper mode,
	 * the status register is not accurate. The PCS status register is
	 * used instead.
	 */
	pcs = E1000_READ_REG(hw, E1000_PCS_LSTAT);

	/*
	 * The link up bit determines when link is up on autoneg.
	 */
	if (pcs & E1000_PCS_LSTS_LINK_OK) {
		mac->serdes_has_link = true;

		/* Detect and store PCS speed */
		if (pcs & E1000_PCS_LSTS_SPEED_1000)
			*speed = SPEED_1000;
		else if (pcs & E1000_PCS_LSTS_SPEED_100)
			*speed = SPEED_100;
		else
			*speed = SPEED_10;

		/* Detect and store PCS duplex */
		if (pcs & E1000_PCS_LSTS_DUPLEX_FULL)
			*duplex = FULL_DUPLEX;
		else
			*duplex = HALF_DUPLEX;

		/* Check if it is an I354 2.5Gb backplane connection. */
		if (mac->type == e1000_i354) {
			status = E1000_READ_REG(hw, E1000_STATUS);
			if ((status & E1000_STATUS_2P5_SKU) &&
			    !(status & E1000_STATUS_2P5_SKU_OVER)) {
				*speed = SPEED_2500;
				*duplex = FULL_DUPLEX;
				DEBUGOUT("2500 Mbs, ");
				DEBUGOUT("Full Duplex\n");
			}
		}

	} else {
		mac->serdes_has_link = false;
		*speed = 0;
		*duplex = 0;
	}

	return E1000_SUCCESS;
}

/**
 *  e1000_shutdown_serdes_link_82575 - Remove link during power down
 *  @hw: pointer to the HW structure
 *
 *  In the case of serdes shut down sfp and PCS on driver unload
 *  when management pass thru is not enabled.
 **/
void e1000_shutdown_serdes_link_82575(struct e1000_hw *hw)
{
	u32 reg;

	DEBUGFUNC("e1000_shutdown_serdes_link_82575");

	if ((hw->phy.media_type != e1000_media_type_internal_serdes) &&
	    !e1000_sgmii_active_82575(hw))
		return;

	if (!e1000_enable_mng_pass_thru(hw)) {
		/* Disable PCS to turn off link */
		reg = E1000_READ_REG(hw, E1000_PCS_CFG0);
		reg &= ~E1000_PCS_CFG_PCS_EN;
		E1000_WRITE_REG(hw, E1000_PCS_CFG0, reg);

		/* shutdown the laser */
		reg = E1000_READ_REG(hw, E1000_CTRL_EXT);
		reg |= E1000_CTRL_EXT_SDP3_DATA;
		E1000_WRITE_REG(hw, E1000_CTRL_EXT, reg);

		/* flush the write to verify completion */
		E1000_WRITE_FLUSH(hw);
		msec_delay(1);
	}

	return;
}

/**
 *  e1000_reset_hw_82575 - Reset hardware
 *  @hw: pointer to the HW structure
 *
 *  This resets the hardware into a known state.
 **/
STATIC s32 e1000_reset_hw_82575(struct e1000_hw *hw)
{
	u32 ctrl;
	s32 ret_val;

	DEBUGFUNC("e1000_reset_hw_82575");

	/*
	 * Prevent the PCI-E bus from sticking if there is no TLP connection
	 * on the last TLP read/write transaction when MAC is reset.
	 */
	ret_val = e1000_disable_pcie_master_generic(hw);
	if (ret_val)
		DEBUGOUT("PCI-E Master disable polling has failed.\n");

	/* set the completion timeout for interface */
	ret_val = e1000_set_pcie_completion_timeout(hw);
	if (ret_val)
		DEBUGOUT("PCI-E Set completion timeout has failed.\n");

	DEBUGOUT("Masking off all interrupts\n");
	E1000_WRITE_REG(hw, E1000_IMC, 0xffffffff);

	E1000_WRITE_REG(hw, E1000_RCTL, 0);
	E1000_WRITE_REG(hw, E1000_TCTL, E1000_TCTL_PSP);
	E1000_WRITE_FLUSH(hw);

	msec_delay(10);

	ctrl = E1000_READ_REG(hw, E1000_CTRL);

	DEBUGOUT("Issuing a global reset to MAC\n");
	E1000_WRITE_REG(hw, E1000_CTRL, ctrl | E1000_CTRL_RST);

	ret_val = e1000_get_auto_rd_done_generic(hw);
	if (ret_val) {
		/*
		 * When auto config read does not complete, do not
		 * return with an error. This can happen in situations
		 * where there is no eeprom and prevents getting link.
		 */
		DEBUGOUT("Auto Read Done did not complete\n");
	}

	/* If EEPROM is not present, run manual init scripts */
	if (!(E1000_READ_REG(hw, E1000_EECD) & E1000_EECD_PRES))
		e1000_reset_init_script_82575(hw);

	/* Clear any pending interrupt events. */
	E1000_WRITE_REG(hw, E1000_IMC, 0xffffffff);
	E1000_READ_REG(hw, E1000_ICR);

	/* Install any alternate MAC address into RAR0 */
	ret_val = e1000_check_alt_mac_addr_generic(hw);

	return ret_val;
}

/**
 *  e1000_init_hw_82575 - Initialize hardware
 *  @hw: pointer to the HW structure
 *
 *  This inits the hardware readying it for operation.
 **/
s32 e1000_init_hw_82575(struct e1000_hw *hw)
{
	struct e1000_mac_info *mac = &hw->mac;
	s32 ret_val;
	u16 i, rar_count = mac->rar_entry_count;

	DEBUGFUNC("e1000_init_hw_82575");

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

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

	/* Setup the receive address */
	e1000_init_rx_addrs_generic(hw, rar_count);

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

	/* Zero out the Unicast HASH table */
	DEBUGOUT("Zeroing the UTA\n");
	for (i = 0; i < mac->uta_reg_count; i++)
		E1000_WRITE_REG_ARRAY(hw, E1000_UTA, i, 0);

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

	/* Set the default MTU size */
	hw->dev_spec._82575.mtu = 1500;

	/*
	 * Clear all of the statistics registers (clear on read).  It is
	 * important that we do this after we have tried to establish link
	 * because the symbol error count will increment wildly if there
	 * is no link.
	 */
	e1000_clear_hw_cntrs_82575(hw);

	return ret_val;
}

/**
 *  e1000_setup_copper_link_82575 - Configure copper link settings
 *  @hw: pointer to the HW structure
 *
 *  Configures the link for auto-neg or forced speed and duplex.  Then we check
 *  for link, once link is established calls to configure collision distance
 *  and flow control are called.
 **/
STATIC s32 e1000_setup_copper_link_82575(struct e1000_hw *hw)
{
	u32 ctrl;
	s32 ret_val;
	u32 phpm_reg;

	DEBUGFUNC("e1000_setup_copper_link_82575");

	ctrl = E1000_READ_REG(hw, E1000_CTRL);
	ctrl |= E1000_CTRL_SLU;
	ctrl &= ~(E1000_CTRL_FRCSPD | E1000_CTRL_FRCDPX);
	E1000_WRITE_REG(hw, E1000_CTRL, ctrl);

	/* Clear Go Link Disconnect bit on supported devices */
	switch (hw->mac.type) {
	case e1000_82580:
	case e1000_i350:
	case e1000_i210:
	case e1000_i211:
		phpm_reg = E1000_READ_REG(hw, E1000_82580_PHY_POWER_MGMT);
		phpm_reg &= ~E1000_82580_PM_GO_LINKD;
		E1000_WRITE_REG(hw, E1000_82580_PHY_POWER_MGMT, phpm_reg);
		break;
	default:
		break;
	}

	ret_val = e1000_setup_serdes_link_82575(hw);
	if (ret_val)
		goto out;

	if (e1000_sgmii_active_82575(hw)) {
		/* allow time for SFP cage time to power up phy */
		msec_delay(300);

		ret_val = hw->phy.ops.reset(hw);
		if (ret_val) {
			DEBUGOUT("Error resetting the PHY.\n");
			goto out;
		}
	}
	switch (hw->phy.type) {
	case e1000_phy_i210:
	case e1000_phy_m88:
		switch (hw->phy.id) {
		case I347AT4_E_PHY_ID:
		case M88E1112_E_PHY_ID:
		case M88E1340M_E_PHY_ID:
		case M88E1543_E_PHY_ID:
		case M88E1512_E_PHY_ID:
		case I210_I_PHY_ID:
			ret_val = e1000_copper_link_setup_m88_gen2(hw);
			break;
		default:
			ret_val = e1000_copper_link_setup_m88(hw);
			break;
		}
		break;
	case e1000_phy_igp_3:
		ret_val = e1000_copper_link_setup_igp(hw);
		break;
	case e1000_phy_82580:
		ret_val = e1000_copper_link_setup_82577(hw);
		break;
	case e1000_phy_none:
		break;
	default:
		ret_val = -E1000_ERR_PHY;
		break;
	}

	if (ret_val)
		goto out;

	ret_val = e1000_setup_copper_link_generic(hw);
out:
	return ret_val;
}

/**
 *  e1000_setup_serdes_link_82575 - Setup link for serdes
 *  @hw: pointer to the HW structure
 *
 *  Configure the physical coding sub-layer (PCS) link.  The PCS link is
 *  used on copper connections where the serialized gigabit media independent
 *  interface (sgmii), or serdes fiber is being used.  Configures the link
 *  for auto-negotiation or forces speed/duplex.
 **/
STATIC s32 e1000_setup_serdes_link_82575(struct e1000_hw *hw)
{
	u32 ctrl_ext, ctrl_reg, reg, anadv_reg;
	bool pcs_autoneg;
	s32 ret_val = E1000_SUCCESS;
	u16 data;

	DEBUGFUNC("e1000_setup_serdes_link_82575");

	if ((hw->phy.media_type != e1000_media_type_internal_serdes) &&
	    !e1000_sgmii_active_82575(hw))
		return ret_val;

	/*
	 * On the 82575, SerDes loopback mode persists until it is
	 * explicitly turned off or a power cycle is performed.  A read to
	 * the register does not indicate its status.  Therefore, we ensure
	 * loopback mode is disabled during initialization.
	 */
	E1000_WRITE_REG(hw, E1000_SCTL, E1000_SCTL_DISABLE_SERDES_LOOPBACK);

	/* power on the sfp cage if present */
	ctrl_ext = E1000_READ_REG(hw, E1000_CTRL_EXT);
	ctrl_ext &= ~E1000_CTRL_EXT_SDP3_DATA;
	E1000_WRITE_REG(hw, E1000_CTRL_EXT, ctrl_ext);

	ctrl_reg = E1000_READ_REG(hw, E1000_CTRL);
	ctrl_reg |= E1000_CTRL_SLU;

	/* set both sw defined pins on 82575/82576*/
	if (hw->mac.type == e1000_82575 || hw->mac.type == e1000_82576)
		ctrl_reg |= E1000_CTRL_SWDPIN0 | E1000_CTRL_SWDPIN1;

	reg = E1000_READ_REG(hw, E1000_PCS_LCTL);

	/* default pcs_autoneg to the same setting as mac autoneg */
	pcs_autoneg = hw->mac.autoneg;

	switch (ctrl_ext & E1000_CTRL_EXT_LINK_MODE_MASK) {
	case E1000_CTRL_EXT_LINK_MODE_SGMII:
		/* sgmii mode lets the phy handle forcing speed/duplex */
		pcs_autoneg = true;
		/* autoneg time out should be disabled for SGMII mode */
		reg &= ~(E1000_PCS_LCTL_AN_TIMEOUT);
		break;
	case E1000_CTRL_EXT_LINK_MODE_1000BASE_KX:
		/* disable PCS autoneg and support parallel detect only */
		pcs_autoneg = false;
		/* fall through to default case */
	default:
		if (hw->mac.type == e1000_82575 ||
		    hw->mac.type == e1000_82576) {
			ret_val = hw->nvm.ops.read(hw, NVM_COMPAT, 1, &data);
			if (ret_val) {
				DEBUGOUT("NVM Read Error\n");
				return ret_val;
			}

			if (data & E1000_EEPROM_PCS_AUTONEG_DISABLE_BIT)
				pcs_autoneg = false;
		}

		/*
		 * non-SGMII modes only supports a speed of 1000/Full for the
		 * link so it is best to just force the MAC and let the pcs
		 * link either autoneg or be forced to 1000/Full
		 */
		ctrl_reg |= E1000_CTRL_SPD_1000 | E1000_CTRL_FRCSPD |
			    E1000_CTRL_FD | E1000_CTRL_FRCDPX;

		/* set speed of 1000/Full if speed/duplex is forced */
		reg |= E1000_PCS_LCTL_FSV_1000 | E1000_PCS_LCTL_FDV_FULL;
		break;
	}

	E1000_WRITE_REG(hw, E1000_CTRL, ctrl_reg);

	/*
	 * New SerDes mode allows for forcing speed or autonegotiating speed
	 * at 1gb. Autoneg should be default set by most drivers. This is the
	 * mode that will be compatible with older link partners and switches.
	 * However, both are supported by the hardware and some drivers/tools.
	 */
	reg &= ~(E1000_PCS_LCTL_AN_ENABLE | E1000_PCS_LCTL_FLV_LINK_UP |
		 E1000_PCS_LCTL_FSD | E1000_PCS_LCTL_FORCE_LINK);

	if (pcs_autoneg) {
		/* Set PCS register for autoneg */
		reg |= E1000_PCS_LCTL_AN_ENABLE | /* Enable Autoneg */
		       E1000_PCS_LCTL_AN_RESTART; /* Restart autoneg */

		/* Disable force flow control for autoneg */
		reg &= ~E1000_PCS_LCTL_FORCE_FCTRL;

		/* Configure flow control advertisement for autoneg */
		anadv_reg = E1000_READ_REG(hw, E1000_PCS_ANADV);
		anadv_reg &= ~(E1000_TXCW_ASM_DIR | E1000_TXCW_PAUSE);

		switch (hw->fc.requested_mode) {
		case e1000_fc_full:
		case e1000_fc_rx_pause:
			anadv_reg |= E1000_TXCW_ASM_DIR;
			anadv_reg |= E1000_TXCW_PAUSE;
			break;
		case e1000_fc_tx_pause:
			anadv_reg |= E1000_TXCW_ASM_DIR;
			break;
		default:
			break;
		}

		E1000_WRITE_REG(hw, E1000_PCS_ANADV, anadv_reg);

		DEBUGOUT1("Configuring Autoneg:PCS_LCTL=0x%08X\n", reg);
	} else {
		/* Set PCS register for forced link */
		reg |= E1000_PCS_LCTL_FSD;	/* Force Speed */

		/* Force flow control for forced link */
		reg |= E1000_PCS_LCTL_FORCE_FCTRL;

		DEBUGOUT1("Configuring Forced Link:PCS_LCTL=0x%08X\n", reg);
	}

	E1000_WRITE_REG(hw, E1000_PCS_LCTL, reg);

	if (!pcs_autoneg && !e1000_sgmii_active_82575(hw))
		e1000_force_mac_fc_generic(hw);

	return ret_val;
}

/**
 *  e1000_get_media_type_82575 - derives current media type.
 *  @hw: pointer to the HW structure
 *
 *  The media type is chosen reflecting few settings.
 *  The following are taken into account:
 *  - link mode set in the current port Init Control Word #3
 *  - current link mode settings in CSR register
 *  - MDIO vs. I2C PHY control interface chosen
 *  - SFP module media type
 **/
STATIC s32 e1000_get_media_type_82575(struct e1000_hw *hw)
{
	struct e1000_dev_spec_82575 *dev_spec = &hw->dev_spec._82575;
	s32 ret_val = E1000_SUCCESS;
	u32 ctrl_ext = 0;
	u32 link_mode = 0;

	/* Set internal phy as default */
	dev_spec->sgmii_active = false;
	dev_spec->module_plugged = false;

	/* Get CSR setting */
	ctrl_ext = E1000_READ_REG(hw, E1000_CTRL_EXT);

	/* extract link mode setting */
	link_mode = ctrl_ext & E1000_CTRL_EXT_LINK_MODE_MASK;

	switch (link_mode) {
	case E1000_CTRL_EXT_LINK_MODE_1000BASE_KX:
		hw->phy.media_type = e1000_media_type_internal_serdes;
		break;
	case E1000_CTRL_EXT_LINK_MODE_GMII:
		hw->phy.media_type = e1000_media_type_copper;
		break;
	case E1000_CTRL_EXT_LINK_MODE_SGMII:
		/* Get phy control interface type set (MDIO vs. I2C)*/
		if (e1000_sgmii_uses_mdio_82575(hw)) {
			hw->phy.media_type = e1000_media_type_copper;
			dev_spec->sgmii_active = true;
			break;
		}
		/* fall through for I2C based SGMII */
	case E1000_CTRL_EXT_LINK_MODE_PCIE_SERDES:
		/* read media type from SFP EEPROM */
		ret_val = e1000_set_sfp_media_type_82575(hw);
		if ((ret_val != E1000_SUCCESS) ||
		    (hw->phy.media_type == e1000_media_type_unknown)) {
			/*
			 * If media type was not identified then return media
			 * type defined by the CTRL_EXT settings.
			 */
			hw->phy.media_type = e1000_media_type_internal_serdes;

			if (link_mode == E1000_CTRL_EXT_LINK_MODE_SGMII) {
				hw->phy.media_type = e1000_media_type_copper;
				dev_spec->sgmii_active = true;
			}

			break;
		}

		/* do not change link mode for 100BaseFX */
		if (dev_spec->eth_flags.e100_base_fx)
			break;

		/* change current link mode setting */
		ctrl_ext &= ~E1000_CTRL_EXT_LINK_MODE_MASK;

		if (hw->phy.media_type == e1000_media_type_copper)
			ctrl_ext |= E1000_CTRL_EXT_LINK_MODE_SGMII;
		else
			ctrl_ext |= E1000_CTRL_EXT_LINK_MODE_PCIE_SERDES;

		E1000_WRITE_REG(hw, E1000_CTRL_EXT, ctrl_ext);

		break;
	}

	return ret_val;
}

/**
 *  e1000_set_sfp_media_type_82575 - derives SFP module media type.
 *  @hw: pointer to the HW structure
 *
 *  The media type is chosen based on SFP module.
 *  compatibility flags retrieved from SFP ID EEPROM.
 **/
STATIC s32 e1000_set_sfp_media_type_82575(struct e1000_hw *hw)
{
	s32 ret_val = E1000_ERR_CONFIG;
	u32 ctrl_ext = 0;
	struct e1000_dev_spec_82575 *dev_spec = &hw->dev_spec._82575;
	struct sfp_e1000_flags *eth_flags = &dev_spec->eth_flags;
	u8 tranceiver_type = 0;
	s32 timeout = 3;

	/* Turn I2C interface ON and power on sfp cage */
	ctrl_ext = E1000_READ_REG(hw, E1000_CTRL_EXT);
	ctrl_ext &= ~E1000_CTRL_EXT_SDP3_DATA;
	E1000_WRITE_REG(hw, E1000_CTRL_EXT, ctrl_ext | E1000_CTRL_I2C_ENA);

	E1000_WRITE_FLUSH(hw);

	/* Read SFP module data */
	while (timeout) {
		ret_val = e1000_read_sfp_data_byte(hw,
			E1000_I2CCMD_SFP_DATA_ADDR(E1000_SFF_IDENTIFIER_OFFSET),
			&tranceiver_type);
		if (ret_val == E1000_SUCCESS)
			break;
		msec_delay(100);
		timeout--;
	}
	if (ret_val != E1000_SUCCESS)
		goto out;

	ret_val = e1000_read_sfp_data_byte(hw,
			E1000_I2CCMD_SFP_DATA_ADDR(E1000_SFF_ETH_FLAGS_OFFSET),
			(u8 *)eth_flags);
	if (ret_val != E1000_SUCCESS)
		goto out;

	/* Check if there is some SFP module plugged and powered */
	if ((tranceiver_type == E1000_SFF_IDENTIFIER_SFP) ||
	    (tranceiver_type == E1000_SFF_IDENTIFIER_SFF)) {
		dev_spec->module_plugged = true;
		if (eth_flags->e1000_base_lx || eth_flags->e1000_base_sx) {
			hw->phy.media_type = e1000_media_type_internal_serdes;
		} else if (eth_flags->e100_base_fx) {
			dev_spec->sgmii_active = true;
			hw->phy.media_type = e1000_media_type_internal_serdes;
		} else if (eth_flags->e1000_base_t) {
			dev_spec->sgmii_active = true;
			hw->phy.media_type = e1000_media_type_copper;
		} else {
			hw->phy.media_type = e1000_media_type_unknown;
			DEBUGOUT("PHY module has not been recognized\n");
			goto out;
		}
	} else {
		hw->phy.media_type = e1000_media_type_unknown;
	}
	ret_val = E1000_SUCCESS;
out:
	/* Restore I2C interface setting */
	E1000_WRITE_REG(hw, E1000_CTRL_EXT, ctrl_ext);
	return ret_val;
}

/**
 *  e1000_valid_led_default_82575 - Verify a valid default LED config
 *  @hw: pointer to the HW structure
 *  @data: pointer to the NVM (EEPROM)
 *
 *  Read the EEPROM for the current default LED configuration.  If the
 *  LED configuration is not valid, set to a valid LED configuration.
 **/
STATIC s32 e1000_valid_led_default_82575(struct e1000_hw *hw, u16 *data)
{
	s32 ret_val;

	DEBUGFUNC("e1000_valid_led_default_82575");

	ret_val = hw->nvm.ops.read(hw, NVM_ID_LED_SETTINGS, 1, data);
	if (ret_val) {
		DEBUGOUT("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_82575_SERDES;
			break;
		case e1000_media_type_copper:
		default:
			*data = ID_LED_DEFAULT;
			break;
		}
	}
out:
	return ret_val;
}

/**
 *  e1000_sgmii_active_82575 - Return sgmii state
 *  @hw: pointer to the HW structure
 *
 *  82575 silicon has a serialized gigabit media independent interface (sgmii)
 *  which can be enabled for use in the embedded applications.  Simply
 *  return the current state of the sgmii interface.
 **/
STATIC bool e1000_sgmii_active_82575(struct e1000_hw *hw)
{
	struct e1000_dev_spec_82575 *dev_spec = &hw->dev_spec._82575;
	return dev_spec->sgmii_active;
}

/**
 *  e1000_reset_init_script_82575 - Inits HW defaults after reset
 *  @hw: pointer to the HW structure
 *
 *  Inits recommended HW defaults after a reset when there is no EEPROM
 *  detected. This is only for the 82575.
 **/
STATIC s32 e1000_reset_init_script_82575(struct e1000_hw *hw)
{
	DEBUGFUNC("e1000_reset_init_script_82575");

	if (hw->mac.type == e1000_82575) {
		DEBUGOUT("Running reset init script for 82575\n");
		/* SerDes configuration via SERDESCTRL */
		e1000_write_8bit_ctrl_reg_generic(hw, E1000_SCTL, 0x00, 0x0C);
		e1000_write_8bit_ctrl_reg_generic(hw, E1000_SCTL, 0x01, 0x78);
		e1000_write_8bit_ctrl_reg_generic(hw, E1000_SCTL, 0x1B, 0x23);
		e1000_write_8bit_ctrl_reg_generic(hw, E1000_SCTL, 0x23, 0x15);

		/* CCM configuration via CCMCTL register */
		e1000_write_8bit_ctrl_reg_generic(hw, E1000_CCMCTL, 0x14, 0x00);
		e1000_write_8bit_ctrl_reg_generic(hw, E1000_CCMCTL, 0x10, 0x00);

		/* PCIe lanes configuration */
		e1000_write_8bit_ctrl_reg_generic(hw, E1000_GIOCTL, 0x00, 0xEC);
		e1000_write_8bit_ctrl_reg_generic(hw, E1000_GIOCTL, 0x61, 0xDF);
		e1000_write_8bit_ctrl_reg_generic(hw, E1000_GIOCTL, 0x34, 0x05);
		e1000_write_8bit_ctrl_reg_generic(hw, E1000_GIOCTL, 0x2F, 0x81);

		/* PCIe PLL Configuration */
		e1000_write_8bit_ctrl_reg_generic(hw, E1000_SCCTL, 0x02, 0x47);
		e1000_write_8bit_ctrl_reg_generic(hw, E1000_SCCTL, 0x14, 0x00);
		e1000_write_8bit_ctrl_reg_generic(hw, E1000_SCCTL, 0x10, 0x00);
	}

	return E1000_SUCCESS;
}

/**
 *  e1000_read_mac_addr_82575 - Read device MAC address
 *  @hw: pointer to the HW structure
 **/
STATIC s32 e1000_read_mac_addr_82575(struct e1000_hw *hw)
{
	s32 ret_val;

	DEBUGFUNC("e1000_read_mac_addr_82575");

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

	ret_val = e1000_read_mac_addr_generic(hw);

out:
	return ret_val;
}

/**
 *  e1000_config_collision_dist_82575 - Configure collision distance
 *  @hw: pointer to the HW structure
 *
 *  Configures the collision distance to the default value and is used
 *  during link setup.
 **/
STATIC void e1000_config_collision_dist_82575(struct e1000_hw *hw)
{
	u32 tctl_ext;

	DEBUGFUNC("e1000_config_collision_dist_82575");

	tctl_ext = E1000_READ_REG(hw, E1000_TCTL_EXT);

	tctl_ext &= ~E1000_TCTL_EXT_COLD;
	tctl_ext |= E1000_COLLISION_DISTANCE << E1000_TCTL_EXT_COLD_SHIFT;

	E1000_WRITE_REG(hw, E1000_TCTL_EXT, tctl_ext);
	E1000_WRITE_FLUSH(hw);
}

/**
 * e1000_power_down_phy_copper_82575 - Remove link during PHY power down
 * @hw: pointer to the HW structure
 *
 * In the case of a PHY power down to save power, or to turn off link during a
 * driver unload, or wake on lan is not enabled, remove the link.
 **/
STATIC void e1000_power_down_phy_copper_82575(struct e1000_hw *hw)
{
	struct e1000_phy_info *phy = &hw->phy;

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

	/* If the management interface is not enabled, then power down */
	if (!(e1000_enable_mng_pass_thru(hw) || phy->ops.check_reset_block(hw)))
		e1000_power_down_phy_copper(hw);

	return;
}

/**
 *  e1000_clear_hw_cntrs_82575 - Clear device specific hardware counters
 *  @hw: pointer to the HW structure
 *
 *  Clears the hardware counters by reading the counter registers.
 **/
STATIC void e1000_clear_hw_cntrs_82575(struct e1000_hw *hw)
{
	DEBUGFUNC("e1000_clear_hw_cntrs_82575");

	e1000_clear_hw_cntrs_base_generic(hw);

	E1000_READ_REG(hw, E1000_PRC64);
	E1000_READ_REG(hw, E1000_PRC127);
	E1000_READ_REG(hw, E1000_PRC255);
	E1000_READ_REG(hw, E1000_PRC511);
	E1000_READ_REG(hw, E1000_PRC1023);
	E1000_READ_REG(hw, E1000_PRC1522);
	E1000_READ_REG(hw, E1000_PTC64);
	E1000_READ_REG(hw, E1000_PTC127);
	E1000_READ_REG(hw, E1000_PTC255);
	E1000_READ_REG(hw, E1000_PTC511);
	E1000_READ_REG(hw, E1000_PTC1023);
	E1000_READ_REG(hw, E1000_PTC1522);

	E1000_READ_REG(hw, E1000_ALGNERRC);
	E1000_READ_REG(hw, E1000_RXERRC);
	E1000_READ_REG(hw, E1000_TNCRS);
	E1000_READ_REG(hw, E1000_CEXTERR);
	E1000_READ_REG(hw, E1000_TSCTC);
	E1000_READ_REG(hw, E1000_TSCTFC);

	E1000_READ_REG(hw, E1000_MGTPRC);
	E1000_READ_REG(hw, E1000_MGTPDC);
	E1000_READ_REG(hw, E1000_MGTPTC);

	E1000_READ_REG(hw, E1000_IAC);
	E1000_READ_REG(hw, E1000_ICRXOC);

	E1000_READ_REG(hw, E1000_ICRXPTC);
	E1000_READ_REG(hw, E1000_ICRXATC);
	E1000_READ_REG(hw, E1000_ICTXPTC);
	E1000_READ_REG(hw, E1000_ICTXATC);
	E1000_READ_REG(hw, E1000_ICTXQEC);
	E1000_READ_REG(hw, E1000_ICTXQMTC);
	E1000_READ_REG(hw, E1000_ICRXDMTC);

	E1000_READ_REG(hw, E1000_CBTMPC);
	E1000_READ_REG(hw, E1000_HTDPMC);
	E1000_READ_REG(hw, E1000_CBRMPC);
	E1000_READ_REG(hw, E1000_RPTHC);
	E1000_READ_REG(hw, E1000_HGPTC);
	E1000_READ_REG(hw, E1000_HTCBDPC);
	E1000_READ_REG(hw, E1000_HGORCL);
	E1000_READ_REG(hw, E1000_HGORCH);
	E1000_READ_REG(hw, E1000_HGOTCL);
	E1000_READ_REG(hw, E1000_HGOTCH);
	E1000_READ_REG(hw, E1000_LENERRS);

	/* This register should not be read in copper configurations */
	if ((hw->phy.media_type == e1000_media_type_internal_serdes) ||
	    e1000_sgmii_active_82575(hw))
		E1000_READ_REG(hw, E1000_SCVPC);
}

/**
 *  e1000_rx_fifo_flush_82575 - Clean rx fifo after Rx enable
 *  @hw: pointer to the HW structure
 *
 *  After Rx enable, if manageability is enabled then there is likely some
 *  bad data at the start of the fifo and possibly in the DMA fifo.  This
 *  function clears the fifos and flushes any packets that came in as rx was
 *  being enabled.
 **/
void e1000_rx_fifo_flush_82575(struct e1000_hw *hw)
{
	u32 rctl, rlpml, rxdctl[4], rfctl, temp_rctl, rx_enabled;
	int i, ms_wait;

	DEBUGFUNC("e1000_rx_fifo_flush_82575");

	/* disable IPv6 options as per hardware errata */
	rfctl = E1000_READ_REG(hw, E1000_RFCTL);
	rfctl |= E1000_RFCTL_IPV6_EX_DIS;
	E1000_WRITE_REG(hw, E1000_RFCTL, rfctl);

	if (hw->mac.type != e1000_82575 ||
	    !(E1000_READ_REG(hw, E1000_MANC) & E1000_MANC_RCV_TCO_EN))
		return;

	/* Disable all Rx queues */
	for (i = 0; i < 4; i++) {
		rxdctl[i] = E1000_READ_REG(hw, E1000_RXDCTL(i));
		E1000_WRITE_REG(hw, E1000_RXDCTL(i),
				rxdctl[i] & ~E1000_RXDCTL_QUEUE_ENABLE);
	}
	/* Poll all queues to verify they have shut down */
	for (ms_wait = 0; ms_wait < 10; ms_wait++) {
		msec_delay(1);
		rx_enabled = 0;
		for (i = 0; i < 4; i++)
			rx_enabled |= E1000_READ_REG(hw, E1000_RXDCTL(i));
		if (!(rx_enabled & E1000_RXDCTL_QUEUE_ENABLE))
			break;
	}

	if (ms_wait == 10)
		DEBUGOUT("Queue disable timed out after 10ms\n");

	/* Clear RLPML, RCTL.SBP, RFCTL.LEF, and set RCTL.LPE so that all
	 * incoming packets are rejected.  Set enable and wait 2ms so that
	 * any packet that was coming in as RCTL.EN was set is flushed
	 */
	E1000_WRITE_REG(hw, E1000_RFCTL, rfctl & ~E1000_RFCTL_LEF);

	rlpml = E1000_READ_REG(hw, E1000_RLPML);
	E1000_WRITE_REG(hw, E1000_RLPML, 0);

	rctl = E1000_READ_REG(hw, E1000_RCTL);
	temp_rctl = rctl & ~(E1000_RCTL_EN | E1000_RCTL_SBP);
	temp_rctl |= E1000_RCTL_LPE;

	E1000_WRITE_REG(hw, E1000_RCTL, temp_rctl);
	E1000_WRITE_REG(hw, E1000_RCTL, temp_rctl | E1000_RCTL_EN);
	E1000_WRITE_FLUSH(hw);
	msec_delay(2);

	/* Enable Rx queues that were previously enabled and restore our
	 * previous state
	 */
	for (i = 0; i < 4; i++)
		E1000_WRITE_REG(hw, E1000_RXDCTL(i), rxdctl[i]);
	E1000_WRITE_REG(hw, E1000_RCTL, rctl);
	E1000_WRITE_FLUSH(hw);

	E1000_WRITE_REG(hw, E1000_RLPML, rlpml);
	E1000_WRITE_REG(hw, E1000_RFCTL, rfctl);

	/* Flush receive errors generated by workaround */
	E1000_READ_REG(hw, E1000_ROC);
	E1000_READ_REG(hw, E1000_RNBC);
	E1000_READ_REG(hw, E1000_MPC);
}

/**
 *  e1000_set_pcie_completion_timeout - set pci-e completion timeout
 *  @hw: pointer to the HW structure
 *
 *  The defaults for 82575 and 82576 should be in the range of 50us to 50ms,
 *  however the hardware default for these parts is 500us to 1ms which is less
 *  than the 10ms recommended by the pci-e spec.  To address this we need to
 *  increase the value to either 10ms to 200ms for capability version 1 config,
 *  or 16ms to 55ms for version 2.
 **/
STATIC s32 e1000_set_pcie_completion_timeout(struct e1000_hw *hw)
{
	u32 gcr = E1000_READ_REG(hw, E1000_GCR);
	s32 ret_val = E1000_SUCCESS;
	u16 pcie_devctl2;

	/* only take action if timeout value is defaulted to 0 */
	if (gcr & E1000_GCR_CMPL_TMOUT_MASK)
		goto out;

	/*
	 * if capababilities version is type 1 we can write the
	 * timeout of 10ms to 200ms through the GCR register
	 */
	if (!(gcr & E1000_GCR_CAP_VER2)) {
		gcr |= E1000_GCR_CMPL_TMOUT_10ms;
		goto out;
	}

	/*
	 * for version 2 capabilities we need to write the config space
	 * directly in order to set the completion timeout value for
	 * 16ms to 55ms
	 */
	ret_val = e1000_read_pcie_cap_reg(hw, PCIE_DEVICE_CONTROL2,
					  &pcie_devctl2);
	if (ret_val)
		goto out;

	pcie_devctl2 |= PCIE_DEVICE_CONTROL2_16ms;

	ret_val = e1000_write_pcie_cap_reg(hw, PCIE_DEVICE_CONTROL2,
					   &pcie_devctl2);
out:
	/* disable completion timeout resend */
	gcr &= ~E1000_GCR_CMPL_TMOUT_RESEND;

	E1000_WRITE_REG(hw, E1000_GCR, gcr);
	return ret_val;
}

/**
 *  e1000_vmdq_set_anti_spoofing_pf - enable or disable anti-spoofing
 *  @hw: pointer to the hardware struct
 *  @enable: state to enter, either enabled or disabled
 *  @pf: Physical Function pool - do not set anti-spoofing for the PF
 *
 *  enables/disables L2 switch anti-spoofing functionality.
 **/
void e1000_vmdq_set_anti_spoofing_pf(struct e1000_hw *hw, bool enable, int pf)
{
	u32 reg_val, reg_offset;

	switch (hw->mac.type) {
	case e1000_82576:
		reg_offset = E1000_DTXSWC;
		break;
	case e1000_i350:
	case e1000_i354:
		reg_offset = E1000_TXSWC;
		break;
	default:
		return;
	}

	reg_val = E1000_READ_REG(hw, reg_offset);
	if (enable) {
		reg_val |= (E1000_DTXSWC_MAC_SPOOF_MASK |
			     E1000_DTXSWC_VLAN_SPOOF_MASK);
		/* The PF can spoof - it has to in order to
		 * support emulation mode NICs
		 */
		reg_val ^= (1 << pf | 1 << (pf + MAX_NUM_VFS));
	} else {
		reg_val &= ~(E1000_DTXSWC_MAC_SPOOF_MASK |
			     E1000_DTXSWC_VLAN_SPOOF_MASK);
	}
	E1000_WRITE_REG(hw, reg_offset, reg_val);
}

/**
 *  e1000_vmdq_set_loopback_pf - enable or disable vmdq loopback
 *  @hw: pointer to the hardware struct
 *  @enable: state to enter, either enabled or disabled
 *
 *  enables/disables L2 switch loopback functionality.
 **/
void e1000_vmdq_set_loopback_pf(struct e1000_hw *hw, bool enable)
{
	u32 dtxswc;

	switch (hw->mac.type) {
	case e1000_82576:
		dtxswc = E1000_READ_REG(hw, E1000_DTXSWC);
		if (enable)
			dtxswc |= E1000_DTXSWC_VMDQ_LOOPBACK_EN;
		else
			dtxswc &= ~E1000_DTXSWC_VMDQ_LOOPBACK_EN;
		E1000_WRITE_REG(hw, E1000_DTXSWC, dtxswc);
		break;
	case e1000_i350:
	case e1000_i354:
		dtxswc = E1000_READ_REG(hw, E1000_TXSWC);
		if (enable)
			dtxswc |= E1000_DTXSWC_VMDQ_LOOPBACK_EN;
		else
			dtxswc &= ~E1000_DTXSWC_VMDQ_LOOPBACK_EN;
		E1000_WRITE_REG(hw, E1000_TXSWC, dtxswc);
		break;
	default:
		/* Currently no other hardware supports loopback */
		break;
	}


}

/**
 *  e1000_vmdq_set_replication_pf - enable or disable vmdq replication
 *  @hw: pointer to the hardware struct
 *  @enable: state to enter, either enabled or disabled
 *
 *  enables/disables replication of packets across multiple pools.
 **/
void e1000_vmdq_set_replication_pf(struct e1000_hw *hw, bool enable)
{
	u32 vt_ctl = E1000_READ_REG(hw, E1000_VT_CTL);

	if (enable)
		vt_ctl |= E1000_VT_CTL_VM_REPL_EN;
	else
		vt_ctl &= ~E1000_VT_CTL_VM_REPL_EN;

	E1000_WRITE_REG(hw, E1000_VT_CTL, vt_ctl);
}

/**
 *  e1000_read_phy_reg_82580 - Read 82580 MDI control register
 *  @hw: pointer to the HW structure
 *  @offset: register offset to be read
 *  @data: pointer to the read data
 *
 *  Reads the MDI control register in the PHY at offset and stores the
 *  information read to data.
 **/
STATIC s32 e1000_read_phy_reg_82580(struct e1000_hw *hw, u32 offset, u16 *data)
{
	s32 ret_val;

	DEBUGFUNC("e1000_read_phy_reg_82580");

	ret_val = hw->phy.ops.acquire(hw);
	if (ret_val)
		goto out;

	ret_val = e1000_read_phy_reg_mdic(hw, offset, data);

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

out:
	return ret_val;
}

/**
 *  e1000_write_phy_reg_82580 - Write 82580 MDI control register
 *  @hw: pointer to the HW structure
 *  @offset: register offset to write to
 *  @data: data to write to register at offset
 *
 *  Writes data to MDI control register in the PHY at offset.
 **/
STATIC s32 e1000_write_phy_reg_82580(struct e1000_hw *hw, u32 offset, u16 data)
{
	s32 ret_val;

	DEBUGFUNC("e1000_write_phy_reg_82580");

	ret_val = hw->phy.ops.acquire(hw);
	if (ret_val)
		goto out;

	ret_val = e1000_write_phy_reg_mdic(hw, offset, data);

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

out:
	return ret_val;
}

/**
 *  e1000_reset_mdicnfg_82580 - Reset MDICNFG destination and com_mdio bits
 *  @hw: pointer to the HW structure
 *
 *  This resets the MDICNFG.Destination and MDICNFG.Com_MDIO bits based on
 *  the values found in the EEPROM.  This addresses an issue in which these
 *  bits are not restored from EEPROM after reset.
 **/
STATIC s32 e1000_reset_mdicnfg_82580(struct e1000_hw *hw)
{
	s32 ret_val = E1000_SUCCESS;
	u32 mdicnfg;
	u16 nvm_data = 0;

	DEBUGFUNC("e1000_reset_mdicnfg_82580");

	if (hw->mac.type != e1000_82580)
		goto out;
	if (!e1000_sgmii_active_82575(hw))
		goto out;

	ret_val = hw->nvm.ops.read(hw, NVM_INIT_CONTROL3_PORT_A +
				   NVM_82580_LAN_FUNC_OFFSET(hw->bus.func), 1,
				   &nvm_data);
	if (ret_val) {
		DEBUGOUT("NVM Read Error\n");
		goto out;
	}

	mdicnfg = E1000_READ_REG(hw, E1000_MDICNFG);
	if (nvm_data & NVM_WORD24_EXT_MDIO)
		mdicnfg |= E1000_MDICNFG_EXT_MDIO;
	if (nvm_data & NVM_WORD24_COM_MDIO)
		mdicnfg |= E1000_MDICNFG_COM_MDIO;
	E1000_WRITE_REG(hw, E1000_MDICNFG, mdicnfg);
out:
	return ret_val;
}

/**
 *  e1000_reset_hw_82580 - Reset hardware
 *  @hw: pointer to the HW structure
 *
 *  This resets function or entire device (all ports, etc.)
 *  to a known state.
 **/
STATIC s32 e1000_reset_hw_82580(struct e1000_hw *hw)
{
	s32 ret_val = E1000_SUCCESS;
	/* BH SW mailbox bit in SW_FW_SYNC */
	u16 swmbsw_mask = E1000_SW_SYNCH_MB;
	u32 ctrl;
	bool global_device_reset = hw->dev_spec._82575.global_device_reset;

	DEBUGFUNC("e1000_reset_hw_82580");

	hw->dev_spec._82575.global_device_reset = false;

	/* 82580 does not reliably do global_device_reset due to hw errata */
	if (hw->mac.type == e1000_82580)
		global_device_reset = false;

	/* Get current control state. */
	ctrl = E1000_READ_REG(hw, E1000_CTRL);

	/*
	 * Prevent the PCI-E bus from sticking if there is no TLP connection
	 * on the last TLP read/write transaction when MAC is reset.
	 */
	ret_val = e1000_disable_pcie_master_generic(hw);
	if (ret_val)
		DEBUGOUT("PCI-E Master disable polling has failed.\n");

	DEBUGOUT("Masking off all interrupts\n");
	E1000_WRITE_REG(hw, E1000_IMC, 0xffffffff);
	E1000_WRITE_REG(hw, E1000_RCTL, 0);
	E1000_WRITE_REG(hw, E1000_TCTL, E1000_TCTL_PSP);
	E1000_WRITE_FLUSH(hw);

	msec_delay(10);

	/* Determine whether or not a global dev reset is requested */
	if (global_device_reset && hw->mac.ops.acquire_swfw_sync(hw,
	    swmbsw_mask))
			global_device_reset = false;

	if (global_device_reset && !(E1000_READ_REG(hw, E1000_STATUS) &
	    E1000_STAT_DEV_RST_SET))
		ctrl |= E1000_CTRL_DEV_RST;
	else
		ctrl |= E1000_CTRL_RST;

	E1000_WRITE_REG(hw, E1000_CTRL, ctrl);

	switch (hw->device_id) {
	case E1000_DEV_ID_DH89XXCC_SGMII:
		break;
	default:
		E1000_WRITE_FLUSH(hw);
		break;
	}

	/* Add delay to insure DEV_RST or RST has time to complete */
	msec_delay(5);

	ret_val = e1000_get_auto_rd_done_generic(hw);
	if (ret_val) {
		/*
		 * When auto config read does not complete, do not
		 * return with an error. This can happen in situations
		 * where there is no eeprom and prevents getting link.
		 */
		DEBUGOUT("Auto Read Done did not complete\n");
	}

	/* clear global device reset status bit */
	E1000_WRITE_REG(hw, E1000_STATUS, E1000_STAT_DEV_RST_SET);

	/* Clear any pending interrupt events. */
	E1000_WRITE_REG(hw, E1000_IMC, 0xffffffff);
	E1000_READ_REG(hw, E1000_ICR);

	ret_val = e1000_reset_mdicnfg_82580(hw);
	if (ret_val)
		DEBUGOUT("Could not reset MDICNFG based on EEPROM\n");

	/* Install any alternate MAC address into RAR0 */
	ret_val = e1000_check_alt_mac_addr_generic(hw);

	/* Release semaphore */
	if (global_device_reset)
		hw->mac.ops.release_swfw_sync(hw, swmbsw_mask);

	return ret_val;
}

/**
 *  e1000_rxpbs_adjust_82580 - adjust RXPBS value to reflect actual Rx PBA size
 *  @data: data received by reading RXPBS register
 *
 *  The 82580 uses a table based approach for packet buffer allocation sizes.
 *  This function converts the retrieved value into the correct table value
 *     0x0 0x1 0x2 0x3 0x4 0x5 0x6 0x7
 *  0x0 36  72 144   1   2   4   8  16
 *  0x8 35  70 140 rsv rsv rsv rsv rsv
 */
u16 e1000_rxpbs_adjust_82580(u32 data)
{
	u16 ret_val = 0;

	if (data < E1000_82580_RXPBS_TABLE_SIZE)
		ret_val = e1000_82580_rxpbs_table[data];

	return ret_val;
}

/**
 *  e1000_validate_nvm_checksum_with_offset - Validate EEPROM
 *  checksum
 *  @hw: pointer to the HW structure
 *  @offset: offset in words of the checksum protected region
 *
 *  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.
 **/
s32 e1000_validate_nvm_checksum_with_offset(struct e1000_hw *hw, u16 offset)
{
	s32 ret_val = E1000_SUCCESS;
	u16 checksum = 0;
	u16 i, nvm_data;

	DEBUGFUNC("e1000_validate_nvm_checksum_with_offset");

	for (i = offset; i < ((NVM_CHECKSUM_REG + offset) + 1); i++) {
		ret_val = hw->nvm.ops.read(hw, i, 1, &nvm_data);
		if (ret_val) {
			DEBUGOUT("NVM Read Error\n");
			goto out;
		}
		checksum += nvm_data;
	}

	if (checksum != (u16) NVM_SUM) {
		DEBUGOUT("NVM Checksum Invalid\n");
		ret_val = -E1000_ERR_NVM;
		goto out;
	}

out:
	return ret_val;
}

/**
 *  e1000_update_nvm_checksum_with_offset - Update EEPROM
 *  checksum
 *  @hw: pointer to the HW structure
 *  @offset: offset in words of the checksum protected region
 *
 *  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.
 **/
s32 e1000_update_nvm_checksum_with_offset(struct e1000_hw *hw, u16 offset)
{
	s32 ret_val;
	u16 checksum = 0;
	u16 i, nvm_data;

	DEBUGFUNC("e1000_update_nvm_checksum_with_offset");

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

out:
	return ret_val;
}

/**
 *  e1000_validate_nvm_checksum_82580 - Validate EEPROM checksum
 *  @hw: pointer to the HW structure
 *
 *  Calculates the EEPROM section checksum by reading/adding each word of
 *  the EEPROM and then verifies that the sum of the EEPROM is
 *  equal to 0xBABA.
 **/
STATIC s32 e1000_validate_nvm_checksum_82580(struct e1000_hw *hw)
{
	s32 ret_val;
	u16 eeprom_regions_count = 1;
	u16 j, nvm_data;
	u16 nvm_offset;

	DEBUGFUNC("e1000_validate_nvm_checksum_82580");

	ret_val = hw->nvm.ops.read(hw, NVM_COMPATIBILITY_REG_3, 1, &nvm_data);
	if (ret_val) {
		DEBUGOUT("NVM Read Error\n");
		goto out;
	}

	if (nvm_data & NVM_COMPATIBILITY_BIT_MASK) {
		/* if chekcsums compatibility bit is set validate checksums
		 * for all 4 ports. */
		eeprom_regions_count = 4;
	}

	for (j = 0; j < eeprom_regions_count; j++) {
		nvm_offset = NVM_82580_LAN_FUNC_OFFSET(j);
		ret_val = e1000_validate_nvm_checksum_with_offset(hw,
								  nvm_offset);
		if (ret_val != E1000_SUCCESS)
			goto out;
	}

out:
	return ret_val;
}

/**
 *  e1000_update_nvm_checksum_82580 - Update EEPROM checksum
 *  @hw: pointer to the HW structure
 *
 *  Updates the EEPROM section checksums for all 4 ports by reading/adding
 *  each word of the EEPROM up to the checksum.  Then calculates the EEPROM
 *  checksum and writes the value to the EEPROM.
 **/
STATIC s32 e1000_update_nvm_checksum_82580(struct e1000_hw *hw)
{
	s32 ret_val;
	u16 j, nvm_data;
	u16 nvm_offset;

	DEBUGFUNC("e1000_update_nvm_checksum_82580");

	ret_val = hw->nvm.ops.read(hw, NVM_COMPATIBILITY_REG_3, 1, &nvm_data);
	if (ret_val) {
		DEBUGOUT("NVM Read Error while updating checksum compatibility bit.\n");
		goto out;
	}

	if (!(nvm_data & NVM_COMPATIBILITY_BIT_MASK)) {
		/* set compatibility bit to validate checksums appropriately */
		nvm_data = nvm_data | NVM_COMPATIBILITY_BIT_MASK;
		ret_val = hw->nvm.ops.write(hw, NVM_COMPATIBILITY_REG_3, 1,
					    &nvm_data);
		if (ret_val) {
			DEBUGOUT("NVM Write Error while updating checksum compatibility bit.\n");
			goto out;
		}
	}

	for (j = 0; j < 4; j++) {
		nvm_offset = NVM_82580_LAN_FUNC_OFFSET(j);
		ret_val = e1000_update_nvm_checksum_with_offset(hw, nvm_offset);
		if (ret_val)
			goto out;
	}

out:
	return ret_val;
}

/**
 *  e1000_validate_nvm_checksum_i350 - Validate EEPROM checksum
 *  @hw: pointer to the HW structure
 *
 *  Calculates the EEPROM section checksum by reading/adding each word of
 *  the EEPROM and then verifies that the sum of the EEPROM is
 *  equal to 0xBABA.
 **/
STATIC s32 e1000_validate_nvm_checksum_i350(struct e1000_hw *hw)
{
	s32 ret_val = E1000_SUCCESS;
	u16 j;
	u16 nvm_offset;

	DEBUGFUNC("e1000_validate_nvm_checksum_i350");

	for (j = 0; j < 4; j++) {
		nvm_offset = NVM_82580_LAN_FUNC_OFFSET(j);
		ret_val = e1000_validate_nvm_checksum_with_offset(hw,
								  nvm_offset);
		if (ret_val != E1000_SUCCESS)
			goto out;
	}

out:
	return ret_val;
}

/**
 *  e1000_update_nvm_checksum_i350 - Update EEPROM checksum
 *  @hw: pointer to the HW structure
 *
 *  Updates the EEPROM section checksums for all 4 ports by reading/adding
 *  each word of the EEPROM up to the checksum.  Then calculates the EEPROM
 *  checksum and writes the value to the EEPROM.
 **/
STATIC s32 e1000_update_nvm_checksum_i350(struct e1000_hw *hw)
{
	s32 ret_val = E1000_SUCCESS;
	u16 j;
	u16 nvm_offset;

	DEBUGFUNC("e1000_update_nvm_checksum_i350");

	for (j = 0; j < 4; j++) {
		nvm_offset = NVM_82580_LAN_FUNC_OFFSET(j);
		ret_val = e1000_update_nvm_checksum_with_offset(hw, nvm_offset);
		if (ret_val != E1000_SUCCESS)
			goto out;
	}

out:
	return ret_val;
}

/**
 *  __e1000_access_emi_reg - Read/write EMI register
 *  @hw: pointer to the HW structure
 *  @addr: EMI address to program
 *  @data: pointer to value to read/write from/to the EMI address
 *  @read: boolean flag to indicate read or write
 **/
STATIC s32 __e1000_access_emi_reg(struct e1000_hw *hw, u16 address,
				  u16 *data, bool read)
{
	s32 ret_val;

	DEBUGFUNC("__e1000_access_emi_reg");

	ret_val = hw->phy.ops.write_reg(hw, E1000_EMIADD, address);
	if (ret_val)
		return ret_val;

	if (read)
		ret_val = hw->phy.ops.read_reg(hw, E1000_EMIDATA, data);
	else
		ret_val = hw->phy.ops.write_reg(hw, E1000_EMIDATA, *data);

	return ret_val;
}

/**
 *  e1000_read_emi_reg - Read Extended Management Interface register
 *  @hw: pointer to the HW structure
 *  @addr: EMI address to program
 *  @data: value to be read from the EMI address
 **/
s32 e1000_read_emi_reg(struct e1000_hw *hw, u16 addr, u16 *data)
{
	DEBUGFUNC("e1000_read_emi_reg");

	return __e1000_access_emi_reg(hw, addr, data, true);
}

/**
 *  e1000_initialize_M88E1512_phy - Initialize M88E1512 PHY
 *  @hw: pointer to the HW structure
 *
 *  Initialize Marvell 1512 to work correctly with Avoton.
 **/
s32 e1000_initialize_M88E1512_phy(struct e1000_hw *hw)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32 ret_val = E1000_SUCCESS;

	DEBUGFUNC("e1000_initialize_M88E1512_phy");

	/* Check if this is correct PHY. */
	if (phy->id != M88E1512_E_PHY_ID)
		goto out;

	/* Switch to PHY page 0xFF. */
	ret_val = phy->ops.write_reg(hw, E1000_M88E1543_PAGE_ADDR, 0x00FF);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_2, 0x214B);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_1, 0x2144);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_2, 0x0C28);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_1, 0x2146);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_2, 0xB233);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_1, 0x214D);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_2, 0xCC0C);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_1, 0x2159);
	if (ret_val)
		goto out;

	/* Switch to PHY page 0xFB. */
	ret_val = phy->ops.write_reg(hw, E1000_M88E1543_PAGE_ADDR, 0x00FB);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_3, 0x000D);
	if (ret_val)
		goto out;

	/* Switch to PHY page 0x12. */
	ret_val = phy->ops.write_reg(hw, E1000_M88E1543_PAGE_ADDR, 0x12);
	if (ret_val)
		goto out;

	/* Change mode to SGMII-to-Copper */
	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_MODE, 0x8001);
	if (ret_val)
		goto out;

	/* Return the PHY to page 0. */
	ret_val = phy->ops.write_reg(hw, E1000_M88E1543_PAGE_ADDR, 0);
	if (ret_val)
		goto out;

	ret_val = phy->ops.commit(hw);
	if (ret_val) {
		DEBUGOUT("Error committing the PHY changes\n");
		return ret_val;
	}

	msec_delay(1000);
out:
	return ret_val;
}

/**
 *  e1000_initialize_M88E1543_phy - Initialize M88E1543 PHY
 *  @hw: pointer to the HW structure
 *
 *  Initialize Marvell 1543 to work correctly with Avoton.
 **/
s32 e1000_initialize_M88E1543_phy(struct e1000_hw *hw)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32 ret_val = E1000_SUCCESS;

	DEBUGFUNC("e1000_initialize_M88E1543_phy");

	/* Check if this is correct PHY. */
	if (phy->id != M88E1543_E_PHY_ID)
		goto out;

	/* Switch to PHY page 0xFF. */
	ret_val = phy->ops.write_reg(hw, E1000_M88E1543_PAGE_ADDR, 0x00FF);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_2, 0x214B);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_1, 0x2144);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_2, 0x0C28);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_1, 0x2146);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_2, 0xB233);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_1, 0x214D);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_2, 0xDC0C);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_1, 0x2159);
	if (ret_val)
		goto out;

	/* Switch to PHY page 0xFB. */
	ret_val = phy->ops.write_reg(hw, E1000_M88E1543_PAGE_ADDR, 0x00FB);
	if (ret_val)
		goto out;

	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_CFG_REG_3, 0xC00D);
	if (ret_val)
		goto out;

	/* Switch to PHY page 0x12. */
	ret_val = phy->ops.write_reg(hw, E1000_M88E1543_PAGE_ADDR, 0x12);
	if (ret_val)
		goto out;

	/* Change mode to SGMII-to-Copper */
	ret_val = phy->ops.write_reg(hw, E1000_M88E1512_MODE, 0x8001);
	if (ret_val)
		goto out;

	/* Switch to PHY page 1. */
	ret_val = phy->ops.write_reg(hw, E1000_M88E1543_PAGE_ADDR, 0x1);
	if (ret_val)
		goto out;

	/* Change mode to 1000BASE-X/SGMII and autoneg enable; reset */
	ret_val = phy->ops.write_reg(hw, E1000_M88E1543_FIBER_CTRL, 0x9140);
	if (ret_val)
		goto out;

	/* Return the PHY to page 0. */
	ret_val = phy->ops.write_reg(hw, E1000_M88E1543_PAGE_ADDR, 0);
	if (ret_val)
		goto out;

	ret_val = phy->ops.commit(hw);
	if (ret_val) {
		DEBUGOUT("Error committing the PHY changes\n");
		return ret_val;
	}

	msec_delay(1000);
out:
	return ret_val;
}

/**
 *  e1000_set_eee_i350 - Enable/disable EEE support
 *  @hw: pointer to the HW structure
 *  @adv1g: boolean flag enabling 1G EEE advertisement
 *  @adv100m: boolean flag enabling 100M EEE advertisement
 *
 *  Enable/disable EEE based on setting in dev_spec structure.
 *
 **/
s32 e1000_set_eee_i350(struct e1000_hw *hw, bool adv1G, bool adv100M)
{
	u32 ipcnfg, eeer;

	DEBUGFUNC("e1000_set_eee_i350");

	if ((hw->mac.type < e1000_i350) ||
	    (hw->phy.media_type != e1000_media_type_copper))
		goto out;
	ipcnfg = E1000_READ_REG(hw, E1000_IPCNFG);
	eeer = E1000_READ_REG(hw, E1000_EEER);

	/* enable or disable per user setting */
	if (!(hw->dev_spec._82575.eee_disable)) {
		u32 eee_su = E1000_READ_REG(hw, E1000_EEE_SU);

		if (adv100M)
			ipcnfg |= E1000_IPCNFG_EEE_100M_AN;
		else
			ipcnfg &= ~E1000_IPCNFG_EEE_100M_AN;

		if (adv1G)
			ipcnfg |= E1000_IPCNFG_EEE_1G_AN;
		else
			ipcnfg &= ~E1000_IPCNFG_EEE_1G_AN;

		eeer |= (E1000_EEER_TX_LPI_EN | E1000_EEER_RX_LPI_EN |
			 E1000_EEER_LPI_FC);

		/* This bit should not be set in normal operation. */
		if (eee_su & E1000_EEE_SU_LPI_CLK_STP)
			DEBUGOUT("LPI Clock Stop Bit should not be set!\n");
	} else {
		ipcnfg &= ~(E1000_IPCNFG_EEE_1G_AN | E1000_IPCNFG_EEE_100M_AN);
		eeer &= ~(E1000_EEER_TX_LPI_EN | E1000_EEER_RX_LPI_EN |
			  E1000_EEER_LPI_FC);
	}
	E1000_WRITE_REG(hw, E1000_IPCNFG, ipcnfg);
	E1000_WRITE_REG(hw, E1000_EEER, eeer);
	E1000_READ_REG(hw, E1000_IPCNFG);
	E1000_READ_REG(hw, E1000_EEER);
out:

	return E1000_SUCCESS;
}

/**
 *  e1000_set_eee_i354 - Enable/disable EEE support
 *  @hw: pointer to the HW structure
 *  @adv1g: boolean flag enabling 1G EEE advertisement
 *  @adv100m: boolean flag enabling 100M EEE advertisement
 *
 *  Enable/disable EEE legacy mode based on setting in dev_spec structure.
 *
 **/
s32 e1000_set_eee_i354(struct e1000_hw *hw, bool adv1G, bool adv100M)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32 ret_val = E1000_SUCCESS;
	u16 phy_data;

	DEBUGFUNC("e1000_set_eee_i354");

	if ((hw->phy.media_type != e1000_media_type_copper) ||
	    ((phy->id != M88E1543_E_PHY_ID) &&
	    (phy->id != M88E1512_E_PHY_ID)))
		goto out;

	if (!hw->dev_spec._82575.eee_disable) {
		/* Switch to PHY page 18. */
		ret_val = phy->ops.write_reg(hw, E1000_M88E1543_PAGE_ADDR, 18);
		if (ret_val)
			goto out;

		ret_val = phy->ops.read_reg(hw, E1000_M88E1543_EEE_CTRL_1,
					    &phy_data);
		if (ret_val)
			goto out;

		phy_data |= E1000_M88E1543_EEE_CTRL_1_MS;
		ret_val = phy->ops.write_reg(hw, E1000_M88E1543_EEE_CTRL_1,
					     phy_data);
		if (ret_val)
			goto out;

		/* Return the PHY to page 0. */
		ret_val = phy->ops.write_reg(hw, E1000_M88E1543_PAGE_ADDR, 0);
		if (ret_val)
			goto out;

		/* Turn on EEE advertisement. */
		ret_val = e1000_read_xmdio_reg(hw, E1000_EEE_ADV_ADDR_I354,
					       E1000_EEE_ADV_DEV_I354,
					       &phy_data);
		if (ret_val)
			goto out;

		if (adv100M)
			phy_data |= E1000_EEE_ADV_100_SUPPORTED;
		else
			phy_data &= ~E1000_EEE_ADV_100_SUPPORTED;

		if (adv1G)
			phy_data |= E1000_EEE_ADV_1000_SUPPORTED;
		else
			phy_data &= ~E1000_EEE_ADV_1000_SUPPORTED;

		ret_val = e1000_write_xmdio_reg(hw, E1000_EEE_ADV_ADDR_I354,
						E1000_EEE_ADV_DEV_I354,
						phy_data);
	} else {
		/* Turn off EEE advertisement. */
		ret_val = e1000_read_xmdio_reg(hw, E1000_EEE_ADV_ADDR_I354,
					       E1000_EEE_ADV_DEV_I354,
					       &phy_data);
		if (ret_val)
			goto out;

		phy_data &= ~(E1000_EEE_ADV_100_SUPPORTED |
			      E1000_EEE_ADV_1000_SUPPORTED);
		ret_val = e1000_write_xmdio_reg(hw, E1000_EEE_ADV_ADDR_I354,
						E1000_EEE_ADV_DEV_I354,
						phy_data);
	}

out:
	return ret_val;
}

/**
 *  e1000_get_eee_status_i354 - Get EEE status
 *  @hw: pointer to the HW structure
 *  @status: EEE status
 *
 *  Get EEE status by guessing based on whether Tx or Rx LPI indications have
 *  been received.
 **/
s32 e1000_get_eee_status_i354(struct e1000_hw *hw, bool *status)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32 ret_val = E1000_SUCCESS;
	u16 phy_data;

	DEBUGFUNC("e1000_get_eee_status_i354");

	/* Check if EEE is supported on this device. */
	if ((hw->phy.media_type != e1000_media_type_copper) ||
	    ((phy->id != M88E1543_E_PHY_ID) &&
	    (phy->id != M88E1512_E_PHY_ID)))
		goto out;

	ret_val = e1000_read_xmdio_reg(hw, E1000_PCS_STATUS_ADDR_I354,
				       E1000_PCS_STATUS_DEV_I354,
				       &phy_data);
	if (ret_val)
		goto out;

	*status = phy_data & (E1000_PCS_STATUS_TX_LPI_RCVD |
			      E1000_PCS_STATUS_RX_LPI_RCVD) ? true : false;

out:
	return ret_val;
}

/* Due to a hw errata, if the host tries to  configure the VFTA register
 * while performing queries from the BMC or DMA, then the VFTA in some
 * cases won't be written.
 */

/**
 *  e1000_clear_vfta_i350 - Clear VLAN filter table
 *  @hw: pointer to the HW structure
 *
 *  Clears the register array which contains the VLAN filter table by
 *  setting all the values to 0.
 **/
void e1000_clear_vfta_i350(struct e1000_hw *hw)
{
	u32 offset;
	int i;

	DEBUGFUNC("e1000_clear_vfta_350");

	for (offset = 0; offset < E1000_VLAN_FILTER_TBL_SIZE; offset++) {
		for (i = 0; i < 10; i++)
			E1000_WRITE_REG_ARRAY(hw, E1000_VFTA, offset, 0);

		E1000_WRITE_FLUSH(hw);
	}
}

/**
 *  e1000_write_vfta_i350 - Write value to VLAN filter table
 *  @hw: pointer to the HW structure
 *  @offset: register offset in VLAN filter table
 *  @value: register value written to VLAN filter table
 *
 *  Writes value at the given offset in the register array which stores
 *  the VLAN filter table.
 **/
void e1000_write_vfta_i350(struct e1000_hw *hw, u32 offset, u32 value)
{
	int i;

	DEBUGFUNC("e1000_write_vfta_350");

	for (i = 0; i < 10; i++)
		E1000_WRITE_REG_ARRAY(hw, E1000_VFTA, offset, value);

	E1000_WRITE_FLUSH(hw);
}


/**
 *  e1000_set_i2c_bb - Enable I2C bit-bang
 *  @hw: pointer to the HW structure
 *
 *  Enable I2C bit-bang interface
 *
 **/
s32 e1000_set_i2c_bb(struct e1000_hw *hw)
{
	s32 ret_val = E1000_SUCCESS;
	u32 ctrl_ext, i2cparams;

	DEBUGFUNC("e1000_set_i2c_bb");

	ctrl_ext = E1000_READ_REG(hw, E1000_CTRL_EXT);
	ctrl_ext |= E1000_CTRL_I2C_ENA;
	E1000_WRITE_REG(hw, E1000_CTRL_EXT, ctrl_ext);
	E1000_WRITE_FLUSH(hw);

	i2cparams = E1000_READ_REG(hw, E1000_I2CPARAMS);
	i2cparams |= E1000_I2CBB_EN;
	i2cparams |= E1000_I2C_DATA_OE_N;
	i2cparams |= E1000_I2C_CLK_OE_N;
	E1000_WRITE_REG(hw, E1000_I2CPARAMS, i2cparams);
	E1000_WRITE_FLUSH(hw);

	return ret_val;
}

/**
 *  e1000_read_i2c_byte_generic - Reads 8 bit word over I2C
 *  @hw: pointer to hardware structure
 *  @byte_offset: byte offset to read
 *  @dev_addr: device address
 *  @data: value read
 *
 *  Performs byte read operation over I2C interface at
 *  a specified device address.
 **/
s32 e1000_read_i2c_byte_generic(struct e1000_hw *hw, u8 byte_offset,
				u8 dev_addr, u8 *data)
{
	s32 status = E1000_SUCCESS;
	u32 max_retry = 10;
	u32 retry = 1;
	u16 swfw_mask = 0;

	bool nack = true;

	DEBUGFUNC("e1000_read_i2c_byte_generic");

	swfw_mask = E1000_SWFW_PHY0_SM;

	do {
		if (hw->mac.ops.acquire_swfw_sync(hw, swfw_mask)
		    != E1000_SUCCESS) {
			status = E1000_ERR_SWFW_SYNC;
			goto read_byte_out;
		}

		e1000_i2c_start(hw);

		/* Device Address and write indication */
		status = e1000_clock_out_i2c_byte(hw, dev_addr);
		if (status != E1000_SUCCESS)
			goto fail;

		status = e1000_get_i2c_ack(hw);
		if (status != E1000_SUCCESS)
			goto fail;

		status = e1000_clock_out_i2c_byte(hw, byte_offset);
		if (status != E1000_SUCCESS)
			goto fail;

		status = e1000_get_i2c_ack(hw);
		if (status != E1000_SUCCESS)
			goto fail;

		e1000_i2c_start(hw);

		/* Device Address and read indication */
		status = e1000_clock_out_i2c_byte(hw, (dev_addr | 0x1));
		if (status != E1000_SUCCESS)
			goto fail;

		status = e1000_get_i2c_ack(hw);
		if (status != E1000_SUCCESS)
			goto fail;

		status = e1000_clock_in_i2c_byte(hw, data);
		if (status != E1000_SUCCESS)
			goto fail;

		status = e1000_clock_out_i2c_bit(hw, nack);
		if (status != E1000_SUCCESS)
			goto fail;

		e1000_i2c_stop(hw);
		break;

fail:
		hw->mac.ops.release_swfw_sync(hw, swfw_mask);
		msec_delay(100);
		e1000_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);

	hw->mac.ops.release_swfw_sync(hw, swfw_mask);

read_byte_out:

	return status;
}

/**
 *  e1000_write_i2c_byte_generic - Writes 8 bit word over I2C
 *  @hw: pointer to hardware structure
 *  @byte_offset: byte offset to write
 *  @dev_addr: device address
 *  @data: value to write
 *
 *  Performs byte write operation over I2C interface at
 *  a specified device address.
 **/
s32 e1000_write_i2c_byte_generic(struct e1000_hw *hw, u8 byte_offset,
				 u8 dev_addr, u8 data)
{
	s32 status = E1000_SUCCESS;
	u32 max_retry = 1;
	u32 retry = 0;
	u16 swfw_mask = 0;

	DEBUGFUNC("e1000_write_i2c_byte_generic");

	swfw_mask = E1000_SWFW_PHY0_SM;

	if (hw->mac.ops.acquire_swfw_sync(hw, swfw_mask) != E1000_SUCCESS) {
		status = E1000_ERR_SWFW_SYNC;
		goto write_byte_out;
	}

	do {
		e1000_i2c_start(hw);

		status = e1000_clock_out_i2c_byte(hw, dev_addr);
		if (status != E1000_SUCCESS)
			goto fail;

		status = e1000_get_i2c_ack(hw);
		if (status != E1000_SUCCESS)
			goto fail;

		status = e1000_clock_out_i2c_byte(hw, byte_offset);
		if (status != E1000_SUCCESS)
			goto fail;

		status = e1000_get_i2c_ack(hw);
		if (status != E1000_SUCCESS)
			goto fail;

		status = e1000_clock_out_i2c_byte(hw, data);
		if (status != E1000_SUCCESS)
			goto fail;

		status = e1000_get_i2c_ack(hw);
		if (status != E1000_SUCCESS)
			goto fail;

		e1000_i2c_stop(hw);
		break;

fail:
		e1000_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);

	hw->mac.ops.release_swfw_sync(hw, swfw_mask);

write_byte_out:

	return status;
}

/**
 *  e1000_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 e1000_i2c_start(struct e1000_hw *hw)
{
	u32 i2cctl = E1000_READ_REG(hw, E1000_I2CPARAMS);

	DEBUGFUNC("e1000_i2c_start");

	/* Start condition must begin with data and clock high */
	e1000_set_i2c_data(hw, &i2cctl, 1);
	e1000_raise_i2c_clk(hw, &i2cctl);

	/* Setup time for start condition (4.7us) */
	usec_delay(E1000_I2C_T_SU_STA);

	e1000_set_i2c_data(hw, &i2cctl, 0);

	/* Hold time for start condition (4us) */
	usec_delay(E1000_I2C_T_HD_STA);

	e1000_lower_i2c_clk(hw, &i2cctl);

	/* Minimum low period of clock is 4.7 us */
	usec_delay(E1000_I2C_T_LOW);

}

/**
 *  e1000_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 e1000_i2c_stop(struct e1000_hw *hw)
{
	u32 i2cctl = E1000_READ_REG(hw, E1000_I2CPARAMS);

	DEBUGFUNC("e1000_i2c_stop");

	/* Stop condition must begin with data low and clock high */
	e1000_set_i2c_data(hw, &i2cctl, 0);
	e1000_raise_i2c_clk(hw, &i2cctl);

	/* Setup time for stop condition (4us) */
	usec_delay(E1000_I2C_T_SU_STO);

	e1000_set_i2c_data(hw, &i2cctl, 1);

	/* bus free time between stop and start (4.7us)*/
	usec_delay(E1000_I2C_T_BUF);
}

/**
 *  e1000_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 e1000_clock_in_i2c_byte(struct e1000_hw *hw, u8 *data)
{
	s32 i;
	bool bit = 0;

	DEBUGFUNC("e1000_clock_in_i2c_byte");

	*data = 0;
	for (i = 7; i >= 0; i--) {
		e1000_clock_in_i2c_bit(hw, &bit);
		*data |= bit << i;
	}

	return E1000_SUCCESS;
}

/**
 *  e1000_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 e1000_clock_out_i2c_byte(struct e1000_hw *hw, u8 data)
{
	s32 status = E1000_SUCCESS;
	s32 i;
	u32 i2cctl;
	bool bit = 0;

	DEBUGFUNC("e1000_clock_out_i2c_byte");

	for (i = 7; i >= 0; i--) {
		bit = (data >> i) & 0x1;
		status = e1000_clock_out_i2c_bit(hw, bit);

		if (status != E1000_SUCCESS)
			break;
	}

	/* Release SDA line (set high) */
	i2cctl = E1000_READ_REG(hw, E1000_I2CPARAMS);

	i2cctl |= E1000_I2C_DATA_OE_N;
	E1000_WRITE_REG(hw, E1000_I2CPARAMS, i2cctl);
	E1000_WRITE_FLUSH(hw);

	return status;
}

/**
 *  e1000_get_i2c_ack - Polls for I2C ACK
 *  @hw: pointer to hardware structure
 *
 *  Clocks in/out one bit via I2C data/clock
 **/
STATIC s32 e1000_get_i2c_ack(struct e1000_hw *hw)
{
	s32 status = E1000_SUCCESS;
	u32 i = 0;
	u32 i2cctl = E1000_READ_REG(hw, E1000_I2CPARAMS);
	u32 timeout = 10;
	bool ack = true;

	DEBUGFUNC("e1000_get_i2c_ack");

	e1000_raise_i2c_clk(hw, &i2cctl);

	/* Minimum high period of clock is 4us */
	usec_delay(E1000_I2C_T_HIGH);

	/* Wait until SCL returns high */
	for (i = 0; i < timeout; i++) {
		usec_delay(1);
		i2cctl = E1000_READ_REG(hw, E1000_I2CPARAMS);
		if (i2cctl & E1000_I2C_CLK_IN)
			break;
	}
	if (!(i2cctl & E1000_I2C_CLK_IN))
		return E1000_ERR_I2C;

	ack = e1000_get_i2c_data(&i2cctl);
	if (ack) {
		DEBUGOUT("I2C ack was not received.\n");
		status = E1000_ERR_I2C;
	}

	e1000_lower_i2c_clk(hw, &i2cctl);

	/* Minimum low period of clock is 4.7 us */
	usec_delay(E1000_I2C_T_LOW);

	return status;
}

/**
 *  e1000_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 e1000_clock_in_i2c_bit(struct e1000_hw *hw, bool *data)
{
	u32 i2cctl = E1000_READ_REG(hw, E1000_I2CPARAMS);

	DEBUGFUNC("e1000_clock_in_i2c_bit");

	e1000_raise_i2c_clk(hw, &i2cctl);

	/* Minimum high period of clock is 4us */
	usec_delay(E1000_I2C_T_HIGH);

	i2cctl = E1000_READ_REG(hw, E1000_I2CPARAMS);
	*data = e1000_get_i2c_data(&i2cctl);

	e1000_lower_i2c_clk(hw, &i2cctl);

	/* Minimum low period of clock is 4.7 us */
	usec_delay(E1000_I2C_T_LOW);

	return E1000_SUCCESS;
}

/**
 *  e1000_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 e1000_clock_out_i2c_bit(struct e1000_hw *hw, bool data)
{
	s32 status;
	u32 i2cctl = E1000_READ_REG(hw, E1000_I2CPARAMS);

	DEBUGFUNC("e1000_clock_out_i2c_bit");

	status = e1000_set_i2c_data(hw, &i2cctl, data);
	if (status == E1000_SUCCESS) {
		e1000_raise_i2c_clk(hw, &i2cctl);

		/* Minimum high period of clock is 4us */
		usec_delay(E1000_I2C_T_HIGH);

		e1000_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(E1000_I2C_T_LOW);
	} else {
		status = E1000_ERR_I2C;
		DEBUGOUT1("I2C data was not set to %X\n", data);
	}

	return status;
}
/**
 *  e1000_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 void e1000_raise_i2c_clk(struct e1000_hw *hw, u32 *i2cctl)
{
	DEBUGFUNC("e1000_raise_i2c_clk");

	*i2cctl |= E1000_I2C_CLK_OUT;
	*i2cctl &= ~E1000_I2C_CLK_OE_N;
	E1000_WRITE_REG(hw, E1000_I2CPARAMS, *i2cctl);
	E1000_WRITE_FLUSH(hw);

	/* SCL rise time (1000ns) */
	usec_delay(E1000_I2C_T_RISE);
}

/**
 *  e1000_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 e1000_lower_i2c_clk(struct e1000_hw *hw, u32 *i2cctl)
{

	DEBUGFUNC("e1000_lower_i2c_clk");

	*i2cctl &= ~E1000_I2C_CLK_OUT;
	*i2cctl &= ~E1000_I2C_CLK_OE_N;
	E1000_WRITE_REG(hw, E1000_I2CPARAMS, *i2cctl);
	E1000_WRITE_FLUSH(hw);

	/* SCL fall time (300ns) */
	usec_delay(E1000_I2C_T_FALL);
}

/**
 *  e1000_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 e1000_set_i2c_data(struct e1000_hw *hw, u32 *i2cctl, bool data)
{
	s32 status = E1000_SUCCESS;

	DEBUGFUNC("e1000_set_i2c_data");

	if (data)
		*i2cctl |= E1000_I2C_DATA_OUT;
	else
		*i2cctl &= ~E1000_I2C_DATA_OUT;

	*i2cctl &= ~E1000_I2C_DATA_OE_N;
	*i2cctl |= E1000_I2C_CLK_OE_N;
	E1000_WRITE_REG(hw, E1000_I2CPARAMS, *i2cctl);
	E1000_WRITE_FLUSH(hw);

	/* Data rise/fall (1000ns/300ns) and set-up time (250ns) */
	usec_delay(E1000_I2C_T_RISE + E1000_I2C_T_FALL + E1000_I2C_T_SU_DATA);

	*i2cctl = E1000_READ_REG(hw, E1000_I2CPARAMS);
	if (data != e1000_get_i2c_data(i2cctl)) {
		status = E1000_ERR_I2C;
		DEBUGOUT1("Error - I2C data was not set to %X.\n", data);
	}

	return status;
}

/**
 *  e1000_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 e1000_get_i2c_data(u32 *i2cctl)
{
	bool data;

	DEBUGFUNC("e1000_get_i2c_data");

	if (*i2cctl & E1000_I2C_DATA_IN)
		data = 1;
	else
		data = 0;

	return data;
}

/**
 *  e1000_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 e1000_i2c_bus_clear(struct e1000_hw *hw)
{
	u32 i2cctl = E1000_READ_REG(hw, E1000_I2CPARAMS);
	u32 i;

	DEBUGFUNC("e1000_i2c_bus_clear");

	e1000_i2c_start(hw);

	e1000_set_i2c_data(hw, &i2cctl, 1);

	for (i = 0; i < 9; i++) {
		e1000_raise_i2c_clk(hw, &i2cctl);

		/* Min high period of clock is 4us */
		usec_delay(E1000_I2C_T_HIGH);

		e1000_lower_i2c_clk(hw, &i2cctl);

		/* Min low period of clock is 4.7us*/
		usec_delay(E1000_I2C_T_LOW);
	}

	e1000_i2c_start(hw);

	/* Put the i2c bus back to default state */
	e1000_i2c_stop(hw);
}

