ich8lan.c

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

  Intel PRO/1000 Linux driver
  Copyright(c) 1999 - 2013 Intel Corporation.

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

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

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

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

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

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

/* 82562G 10/100 Network Connection
 * 82562G-2 10/100 Network Connection
 * 82562GT 10/100 Network Connection
 * 82562GT-2 10/100 Network Connection
 * 82562V 10/100 Network Connection
 * 82562V-2 10/100 Network Connection
 * 82566DC-2 Gigabit Network Connection
 * 82566DC Gigabit Network Connection
 * 82566DM-2 Gigabit Network Connection
 * 82566DM Gigabit Network Connection
 * 82566MC Gigabit Network Connection
 * 82566MM Gigabit Network Connection
 * 82567LM Gigabit Network Connection
 * 82567LF Gigabit Network Connection
 * 82567V Gigabit Network Connection
 * 82567LM-2 Gigabit Network Connection
 * 82567LF-2 Gigabit Network Connection
 * 82567V-2 Gigabit Network Connection
 * 82567LF-3 Gigabit Network Connection
 * 82567LM-3 Gigabit Network Connection
 * 82567LM-4 Gigabit Network Connection
 * 82577LM Gigabit Network Connection
 * 82577LC Gigabit Network Connection
 * 82578DM Gigabit Network Connection
 * 82578DC Gigabit Network Connection
 * 82579LM Gigabit Network Connection
 * 82579V Gigabit Network Connection
 */

#include "e1000.h"

#define ICH_FLASH_GFPREG		0x0000
#define ICH_FLASH_HSFSTS		0x0004
#define ICH_FLASH_HSFCTL		0x0006
#define ICH_FLASH_FADDR			0x0008
#define ICH_FLASH_FDATA0		0x0010
#define ICH_FLASH_PR0			0x0074

#define ICH_FLASH_READ_COMMAND_TIMEOUT	500
#define ICH_FLASH_WRITE_COMMAND_TIMEOUT	500
#define ICH_FLASH_ERASE_COMMAND_TIMEOUT	3000000
#define ICH_FLASH_LINEAR_ADDR_MASK	0x00FFFFFF
#define ICH_FLASH_CYCLE_REPEAT_COUNT	10

#define ICH_CYCLE_READ			0
#define ICH_CYCLE_WRITE			2
#define ICH_CYCLE_ERASE			3

#define FLASH_GFPREG_BASE_MASK		0x1FFF
#define FLASH_SECTOR_ADDR_SHIFT		12

#define ICH_FLASH_SEG_SIZE_256		256
#define ICH_FLASH_SEG_SIZE_4K		4096
#define ICH_FLASH_SEG_SIZE_8K		8192
#define ICH_FLASH_SEG_SIZE_64K		65536


#define E1000_ICH_FWSM_RSPCIPHY	0x00000040 /* Reset PHY on PCI Reset */
/* FW established a valid mode */
#define E1000_ICH_FWSM_FW_VALID		0x00008000

#define E1000_ICH_MNG_IAMT_MODE		0x2

#define ID_LED_DEFAULT_ICH8LAN  ((ID_LED_DEF1_DEF2 << 12) | \
				 (ID_LED_DEF1_OFF2 <<  8) | \
				 (ID_LED_DEF1_ON2  <<  4) | \
				 (ID_LED_DEF1_DEF2))

#define E1000_ICH_NVM_SIG_WORD		0x13
#define E1000_ICH_NVM_SIG_MASK		0xC000
#define E1000_ICH_NVM_VALID_SIG_MASK    0xC0
#define E1000_ICH_NVM_SIG_VALUE         0x80

#define E1000_ICH8_LAN_INIT_TIMEOUT	1500

#define E1000_FEXTNVM_SW_CONFIG		1
#define E1000_FEXTNVM_SW_CONFIG_ICH8M (1 << 27) /* Bit redefined for ICH8M :/ */

#define E1000_FEXTNVM3_PHY_CFG_COUNTER_MASK    0x0C000000
#define E1000_FEXTNVM3_PHY_CFG_COUNTER_50MSEC  0x08000000

#define E1000_FEXTNVM4_BEACON_DURATION_MASK    0x7
#define E1000_FEXTNVM4_BEACON_DURATION_8USEC   0x7
#define E1000_FEXTNVM4_BEACON_DURATION_16USEC  0x3

#define PCIE_ICH8_SNOOP_ALL		PCIE_NO_SNOOP_ALL

#define E1000_ICH_RAR_ENTRIES		7
#define E1000_PCH2_RAR_ENTRIES		5 /* RAR[0], SHRA[0-3] */
#define E1000_PCH_LPT_RAR_ENTRIES	12 /* RAR[0], SHRA[0-10] */

#define PHY_PAGE_SHIFT 5
#define PHY_REG(page, reg) (((page) << PHY_PAGE_SHIFT) | \
			   ((reg) & MAX_PHY_REG_ADDRESS))
#define IGP3_KMRN_DIAG  PHY_REG(770, 19) /* KMRN Diagnostic */
#define IGP3_VR_CTRL    PHY_REG(776, 18) /* Voltage Regulator Control */

#define IGP3_KMRN_DIAG_PCS_LOCK_LOSS	0x0002
#define IGP3_VR_CTRL_DEV_POWERDOWN_MODE_MASK 0x0300
#define IGP3_VR_CTRL_MODE_SHUTDOWN	0x0200

#define HV_LED_CONFIG		PHY_REG(768, 30) /* LED Configuration */

#define SW_FLAG_TIMEOUT    1000 /* SW Semaphore flag timeout in milliseconds */

/* SMBus Control Phy Register */
#define CV_SMB_CTRL		PHY_REG(769, 23)
#define CV_SMB_CTRL_FORCE_SMBUS	0x0001

/* SMBus Address Phy Register */
#define HV_SMB_ADDR            PHY_REG(768, 26)
#define HV_SMB_ADDR_MASK       0x007F
#define HV_SMB_ADDR_PEC_EN     0x0200
#define HV_SMB_ADDR_VALID      0x0080
#define HV_SMB_ADDR_FREQ_MASK           0x1100
#define HV_SMB_ADDR_FREQ_LOW_SHIFT      8
#define HV_SMB_ADDR_FREQ_HIGH_SHIFT     12

/* PHY Power Management Control */
#define HV_PM_CTRL		PHY_REG(770, 17)
#define HV_PM_CTRL_PLL_STOP_IN_K1_GIGA	0x100

/* Intel Rapid Start Technology Support */
#define I217_PROXY_CTRL                 BM_PHY_REG(BM_WUC_PAGE, 70)
#define I217_PROXY_CTRL_AUTO_DISABLE    0x0080
#define I217_SxCTRL                     PHY_REG(BM_PORT_CTRL_PAGE, 28)
#define I217_SxCTRL_ENABLE_LPI_RESET    0x1000
#define I217_CGFREG                     PHY_REG(772, 29)
#define I217_CGFREG_ENABLE_MTA_RESET    0x0002
#define I217_MEMPWR                     PHY_REG(772, 26)
#define I217_MEMPWR_DISABLE_SMB_RELEASE 0x0010

/* Strapping Option Register - RO */
#define E1000_STRAP                     0x0000C
#define E1000_STRAP_SMBUS_ADDRESS_MASK  0x00FE0000
#define E1000_STRAP_SMBUS_ADDRESS_SHIFT 17
#define E1000_STRAP_SMT_FREQ_MASK       0x00003000
#define E1000_STRAP_SMT_FREQ_SHIFT      12

/* OEM Bits Phy Register */
#define HV_OEM_BITS            PHY_REG(768, 25)
#define HV_OEM_BITS_LPLU       0x0004 /* Low Power Link Up */
#define HV_OEM_BITS_GBE_DIS    0x0040 /* Gigabit Disable */
#define HV_OEM_BITS_RESTART_AN 0x0400 /* Restart Auto-negotiation */

#define E1000_NVM_K1_CONFIG 0x1B /* NVM K1 Config Word */
#define E1000_NVM_K1_ENABLE 0x1  /* NVM Enable K1 bit */

/* KMRN Mode Control */
#define HV_KMRN_MODE_CTRL      PHY_REG(769, 16)
#define HV_KMRN_MDIO_SLOW      0x0400

/* KMRN FIFO Control and Status */
#define HV_KMRN_FIFO_CTRLSTA                  PHY_REG(770, 16)
#define HV_KMRN_FIFO_CTRLSTA_PREAMBLE_MASK    0x7000
#define HV_KMRN_FIFO_CTRLSTA_PREAMBLE_SHIFT   12

/* ICH GbE Flash Hardware Sequencing Flash Status Register bit breakdown */
/* Offset 04h HSFSTS */
union ich8_hws_flash_status {
	struct ich8_hsfsts {
		u16 flcdone    :1; /* bit 0 Flash Cycle Done */
		u16 flcerr     :1; /* bit 1 Flash Cycle Error */
		u16 dael       :1; /* bit 2 Direct Access error Log */
		u16 berasesz   :2; /* bit 4:3 Sector Erase Size */
		u16 flcinprog  :1; /* bit 5 flash cycle in Progress */
		u16 reserved1  :2; /* bit 13:6 Reserved */
		u16 reserved2  :6; /* bit 13:6 Reserved */
		u16 fldesvalid :1; /* bit 14 Flash Descriptor Valid */
		u16 flockdn    :1; /* bit 15 Flash Config Lock-Down */
	} hsf_status;
	u16 regval;
};

/* ICH GbE Flash Hardware Sequencing Flash control Register bit breakdown */
/* Offset 06h FLCTL */
union ich8_hws_flash_ctrl {
	struct ich8_hsflctl {
		u16 flcgo      :1;   /* 0 Flash Cycle Go */
		u16 flcycle    :2;   /* 2:1 Flash Cycle */
		u16 reserved   :5;   /* 7:3 Reserved  */
		u16 fldbcount  :2;   /* 9:8 Flash Data Byte Count */
		u16 flockdn    :6;   /* 15:10 Reserved */
	} hsf_ctrl;
	u16 regval;
};

/* ICH Flash Region Access Permissions */
union ich8_hws_flash_regacc {
	struct ich8_flracc {
		u32 grra      :8; /* 0:7 GbE region Read Access */
		u32 grwa      :8; /* 8:15 GbE region Write Access */
		u32 gmrag     :8; /* 23:16 GbE Master Read Access Grant */
		u32 gmwag     :8; /* 31:24 GbE Master Write Access Grant */
	} hsf_flregacc;
	u16 regval;
};

/* ICH Flash Protected Region */
union ich8_flash_protected_range {
	struct ich8_pr {
		u32 base:13;     /* 0:12 Protected Range Base */
		u32 reserved1:2; /* 13:14 Reserved */
		u32 rpe:1;       /* 15 Read Protection Enable */
		u32 limit:13;    /* 16:28 Protected Range Limit */
		u32 reserved2:2; /* 29:30 Reserved */
		u32 wpe:1;       /* 31 Write Protection Enable */
	} range;
	u32 regval;
};

static void e1000_clear_hw_cntrs_ich8lan(struct e1000_hw *hw);
static void e1000_initialize_hw_bits_ich8lan(struct e1000_hw *hw);
static s32 e1000_erase_flash_bank_ich8lan(struct e1000_hw *hw, u32 bank);
static s32 e1000_retry_write_flash_byte_ich8lan(struct e1000_hw *hw,
						u32 offset, u8 byte);
static s32 e1000_read_flash_byte_ich8lan(struct e1000_hw *hw, u32 offset,
					 u8 *data);
static s32 e1000_read_flash_word_ich8lan(struct e1000_hw *hw, u32 offset,
					 u16 *data);
static s32 e1000_read_flash_data_ich8lan(struct e1000_hw *hw, u32 offset,
					 u8 size, u16 *data);
static s32 e1000_kmrn_lock_loss_workaround_ich8lan(struct e1000_hw *hw);
static s32 e1000_cleanup_led_ich8lan(struct e1000_hw *hw);
static s32 e1000_led_on_ich8lan(struct e1000_hw *hw);
static s32 e1000_led_off_ich8lan(struct e1000_hw *hw);
static s32 e1000_id_led_init_pchlan(struct e1000_hw *hw);
static s32 e1000_setup_led_pchlan(struct e1000_hw *hw);
static s32 e1000_cleanup_led_pchlan(struct e1000_hw *hw);
static s32 e1000_led_on_pchlan(struct e1000_hw *hw);
static s32 e1000_led_off_pchlan(struct e1000_hw *hw);
static s32 e1000_set_lplu_state_pchlan(struct e1000_hw *hw, bool active);
static void e1000_power_down_phy_copper_ich8lan(struct e1000_hw *hw);
static void e1000_lan_init_done_ich8lan(struct e1000_hw *hw);
static s32 e1000_k1_gig_workaround_hv(struct e1000_hw *hw, bool link);
static s32 e1000_set_mdio_slow_mode_hv(struct e1000_hw *hw);
static bool e1000_check_mng_mode_ich8lan(struct e1000_hw *hw);
static bool e1000_check_mng_mode_pchlan(struct e1000_hw *hw);
static void e1000_rar_set_pch2lan(struct e1000_hw *hw, u8 *addr, u32 index);
static void e1000_rar_set_pch_lpt(struct e1000_hw *hw, u8 *addr, u32 index);
static s32 e1000_k1_workaround_lv(struct e1000_hw *hw);
static void e1000_gate_hw_phy_config_ich8lan(struct e1000_hw *hw, bool gate);

static inline u16 __er16flash(struct e1000_hw *hw, unsigned long reg)
{
	return readw(hw->flash_address + reg);
}

static inline u32 __er32flash(struct e1000_hw *hw, unsigned long reg)
{
	return readl(hw->flash_address + reg);
}

static inline void __ew16flash(struct e1000_hw *hw, unsigned long reg, u16 val)
{
	writew(val, hw->flash_address + reg);
}

static inline void __ew32flash(struct e1000_hw *hw, unsigned long reg, u32 val)
{
	writel(val, hw->flash_address + reg);
}

#define er16flash(reg)		__er16flash(hw, (reg))
#define er32flash(reg)		__er32flash(hw, (reg))
#define ew16flash(reg, val)	__ew16flash(hw, (reg), (val))
#define ew32flash(reg, val)	__ew32flash(hw, (reg), (val))

/**
 *  e1000_phy_is_accessible_pchlan - Check if able to access PHY registers
 *  @hw: pointer to the HW structure
 *
 *  Test access to the PHY registers by reading the PHY ID registers.  If
 *  the PHY ID is already known (e.g. resume path) compare it with known ID,
 *  otherwise assume the read PHY ID is correct if it is valid.
 *
 *  Assumes the sw/fw/hw semaphore is already acquired.
 **/
static bool e1000_phy_is_accessible_pchlan(struct e1000_hw *hw)
{
	u16 phy_reg = 0;
	u32 phy_id = 0;
	s32 ret_val;
	u16 retry_count;

	for (retry_count = 0; retry_count < 2; retry_count++) {
		ret_val = e1e_rphy_locked(hw, PHY_ID1, &phy_reg);
		if (ret_val || (phy_reg == 0xFFFF))
			continue;
		phy_id = (u32)(phy_reg << 16);

		ret_val = e1e_rphy_locked(hw, PHY_ID2, &phy_reg);
		if (ret_val || (phy_reg == 0xFFFF)) {
			phy_id = 0;
			continue;
		}
		phy_id |= (u32)(phy_reg & PHY_REVISION_MASK);
		break;
	}

	if (hw->phy.id) {
		if (hw->phy.id == phy_id)
			return true;
	} else if (phy_id) {
		hw->phy.id = phy_id;
		hw->phy.revision = (u32)(phy_reg & ~PHY_REVISION_MASK);
		return true;
	}

	/* In case the PHY needs to be in mdio slow mode,
	 * set slow mode and try to get the PHY id again.
	 */
	hw->phy.ops.release(hw);
	ret_val = e1000_set_mdio_slow_mode_hv(hw);
	if (!ret_val)
		ret_val = e1000e_get_phy_id(hw);
	hw->phy.ops.acquire(hw);

	return !ret_val;
}

/**
 *  e1000_init_phy_workarounds_pchlan - PHY initialization workarounds
 *  @hw: pointer to the HW structure
 *
 *  Workarounds/flow necessary for PHY initialization during driver load
 *  and resume paths.
 **/
static s32 e1000_init_phy_workarounds_pchlan(struct e1000_hw *hw)
{
	u32 mac_reg, fwsm = er32(FWSM);
	s32 ret_val;
	u16 phy_reg;

	/* Gate automatic PHY configuration by hardware on managed and
	 * non-managed 82579 and newer adapters.
	 */
	e1000_gate_hw_phy_config_ich8lan(hw, true);

	ret_val = hw->phy.ops.acquire(hw);
	if (ret_val) {
		e_dbg("Failed to initialize PHY flow\n");
		goto out;
	}

	/* The MAC-PHY interconnect may be in SMBus mode.  If the PHY is
	 * inaccessible and resetting the PHY is not blocked, toggle the
	 * LANPHYPC Value bit to force the interconnect to PCIe mode.
	 */
	switch (hw->mac.type) {
	case e1000_pch_lpt:
		if (e1000_phy_is_accessible_pchlan(hw))
			break;

		/* Before toggling LANPHYPC, see if PHY is accessible by
		 * forcing MAC to SMBus mode first.
		 */
		mac_reg = er32(CTRL_EXT);
		mac_reg |= E1000_CTRL_EXT_FORCE_SMBUS;
		ew32(CTRL_EXT, mac_reg);

		/* fall-through */
	case e1000_pch2lan:
		if (e1000_phy_is_accessible_pchlan(hw)) {
			if (hw->mac.type == e1000_pch_lpt) {
				/* Unforce SMBus mode in PHY */
				e1e_rphy_locked(hw, CV_SMB_CTRL, &phy_reg);
				phy_reg &= ~CV_SMB_CTRL_FORCE_SMBUS;
				e1e_wphy_locked(hw, CV_SMB_CTRL, phy_reg);

				/* Unforce SMBus mode in MAC */
				mac_reg = er32(CTRL_EXT);
				mac_reg &= ~E1000_CTRL_EXT_FORCE_SMBUS;
				ew32(CTRL_EXT, mac_reg);
			}
			break;
		}

		/* fall-through */
	case e1000_pchlan:
		if ((hw->mac.type == e1000_pchlan) &&
		    (fwsm & E1000_ICH_FWSM_FW_VALID))
			break;

		if (hw->phy.ops.check_reset_block(hw)) {
			e_dbg("Required LANPHYPC toggle blocked by ME\n");
			break;
		}

		e_dbg("Toggling LANPHYPC\n");

		/* Set Phy Config Counter to 50msec */
		mac_reg = er32(FEXTNVM3);
		mac_reg &= ~E1000_FEXTNVM3_PHY_CFG_COUNTER_MASK;
		mac_reg |= E1000_FEXTNVM3_PHY_CFG_COUNTER_50MSEC;
		ew32(FEXTNVM3, mac_reg);

		if (hw->mac.type == e1000_pch_lpt) {
			/* Toggling LANPHYPC brings the PHY out of SMBus mode
			 * So ensure that the MAC is also out of SMBus mode
			 */
			mac_reg = er32(CTRL_EXT);
			mac_reg &= ~E1000_CTRL_EXT_FORCE_SMBUS;
			ew32(CTRL_EXT, mac_reg);
		}

		/* Toggle LANPHYPC Value bit */
		mac_reg = er32(CTRL);
		mac_reg |= E1000_CTRL_LANPHYPC_OVERRIDE;
		mac_reg &= ~E1000_CTRL_LANPHYPC_VALUE;
		ew32(CTRL, mac_reg);
		e1e_flush();
		udelay(10);
		mac_reg &= ~E1000_CTRL_LANPHYPC_OVERRIDE;
		ew32(CTRL, mac_reg);
		e1e_flush();
		if (hw->mac.type < e1000_pch_lpt) {
			msleep(50);
		} else {
			u16 count = 20;
			do {
				usleep_range(5000, 10000);
			} while (!(er32(CTRL_EXT) &
				   E1000_CTRL_EXT_LPCD) && count--);
		}
		break;
	default:
		break;
	}

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

	/* Reset the PHY before any access to it.  Doing so, ensures
	 * that the PHY is in a known good state before we read/write
	 * PHY registers.  The generic reset is sufficient here,
	 * because we haven't determined the PHY type yet.
	 */
	ret_val = e1000e_phy_hw_reset_generic(hw);

out:
	/* Ungate automatic PHY configuration on non-managed 82579 */
	if ((hw->mac.type == e1000_pch2lan) &&
	    !(fwsm & E1000_ICH_FWSM_FW_VALID)) {
		usleep_range(10000, 20000);
		e1000_gate_hw_phy_config_ich8lan(hw, false);
	}

	return ret_val;
}

/**
 *  e1000_init_phy_params_pchlan - Initialize PHY function pointers
 *  @hw: pointer to the HW structure
 *
 *  Initialize family-specific PHY parameters and function pointers.
 **/
static s32 e1000_init_phy_params_pchlan(struct e1000_hw *hw)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32 ret_val;

	phy->addr                     = 1;
	phy->reset_delay_us           = 100;

	phy->ops.set_page             = e1000_set_page_igp;
	phy->ops.read_reg             = e1000_read_phy_reg_hv;
	phy->ops.read_reg_locked      = e1000_read_phy_reg_hv_locked;
	phy->ops.read_reg_page        = e1000_read_phy_reg_page_hv;
	phy->ops.set_d0_lplu_state    = e1000_set_lplu_state_pchlan;
	phy->ops.set_d3_lplu_state    = e1000_set_lplu_state_pchlan;
	phy->ops.write_reg            = e1000_write_phy_reg_hv;
	phy->ops.write_reg_locked     = e1000_write_phy_reg_hv_locked;
	phy->ops.write_reg_page       = e1000_write_phy_reg_page_hv;
	phy->ops.power_up             = e1000_power_up_phy_copper;
	phy->ops.power_down           = e1000_power_down_phy_copper_ich8lan;
	phy->autoneg_mask             = AUTONEG_ADVERTISE_SPEED_DEFAULT;

	phy->id = e1000_phy_unknown;

	ret_val = e1000_init_phy_workarounds_pchlan(hw);
	if (ret_val)
		return ret_val;

	if (phy->id == e1000_phy_unknown)
		switch (hw->mac.type) {
		default:
			ret_val = e1000e_get_phy_id(hw);
			if (ret_val)
				return ret_val;
			if ((phy->id != 0) && (phy->id != PHY_REVISION_MASK))
				break;
			/* fall-through */
		case e1000_pch2lan:
		case e1000_pch_lpt:
			/* In case the PHY needs to be in mdio slow mode,
			 * set slow mode and try to get the PHY id again.
			 */
			ret_val = e1000_set_mdio_slow_mode_hv(hw);
			if (ret_val)
				return ret_val;
			ret_val = e1000e_get_phy_id(hw);
			if (ret_val)
				return ret_val;
			break;
		}
	phy->type = e1000e_get_phy_type_from_id(phy->id);

	switch (phy->type) {
	case e1000_phy_82577:
	case e1000_phy_82579:
	case e1000_phy_i217:
		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.commit = e1000e_phy_sw_reset;
		break;
	case e1000_phy_82578:
		phy->ops.check_polarity = e1000_check_polarity_m88;
		phy->ops.force_speed_duplex = e1000e_phy_force_speed_duplex_m88;
		phy->ops.get_cable_length = e1000e_get_cable_length_m88;
		phy->ops.get_info = e1000e_get_phy_info_m88;
		break;
	default:
		ret_val = -E1000_ERR_PHY;
		break;
	}

	return ret_val;
}

/**
 *  e1000_init_phy_params_ich8lan - Initialize PHY function pointers
 *  @hw: pointer to the HW structure
 *
 *  Initialize family-specific PHY parameters and function pointers.
 **/
static s32 e1000_init_phy_params_ich8lan(struct e1000_hw *hw)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32 ret_val;
	u16 i = 0;

	phy->addr			= 1;
	phy->reset_delay_us		= 100;

	phy->ops.power_up               = e1000_power_up_phy_copper;
	phy->ops.power_down             = e1000_power_down_phy_copper_ich8lan;

	/* We may need to do this twice - once for IGP and if that fails,
	 * we'll set BM func pointers and try again
	 */
	ret_val = e1000e_determine_phy_address(hw);
	if (ret_val) {
		phy->ops.write_reg = e1000e_write_phy_reg_bm;
		phy->ops.read_reg  = e1000e_read_phy_reg_bm;
		ret_val = e1000e_determine_phy_address(hw);
		if (ret_val) {
			e_dbg("Cannot determine PHY addr. Erroring out\n");
			return ret_val;
		}
	}

	phy->id = 0;
	while ((e1000_phy_unknown == e1000e_get_phy_type_from_id(phy->id)) &&
	       (i++ < 100)) {
		usleep_range(1000, 2000);
		ret_val = e1000e_get_phy_id(hw);
		if (ret_val)
			return ret_val;
	}

	/* Verify phy id */
	switch (phy->id) {
	case IGP03E1000_E_PHY_ID:
		phy->type = e1000_phy_igp_3;
		phy->autoneg_mask = AUTONEG_ADVERTISE_SPEED_DEFAULT;
		phy->ops.read_reg_locked = e1000e_read_phy_reg_igp_locked;
		phy->ops.write_reg_locked = e1000e_write_phy_reg_igp_locked;
		phy->ops.get_info = e1000e_get_phy_info_igp;
		phy->ops.check_polarity = e1000_check_polarity_igp;
		phy->ops.force_speed_duplex = e1000e_phy_force_speed_duplex_igp;
		break;
	case IFE_E_PHY_ID:
	case IFE_PLUS_E_PHY_ID:
	case IFE_C_E_PHY_ID:
		phy->type = e1000_phy_ife;
		phy->autoneg_mask = E1000_ALL_NOT_GIG;
		phy->ops.get_info = e1000_get_phy_info_ife;
		phy->ops.check_polarity = e1000_check_polarity_ife;
		phy->ops.force_speed_duplex = e1000_phy_force_speed_duplex_ife;
		break;
	case BME1000_E_PHY_ID:
		phy->type = e1000_phy_bm;
		phy->autoneg_mask = AUTONEG_ADVERTISE_SPEED_DEFAULT;
		phy->ops.read_reg = e1000e_read_phy_reg_bm;
		phy->ops.write_reg = e1000e_write_phy_reg_bm;
		phy->ops.commit = e1000e_phy_sw_reset;
		phy->ops.get_info = e1000e_get_phy_info_m88;
		phy->ops.check_polarity = e1000_check_polarity_m88;
		phy->ops.force_speed_duplex = e1000e_phy_force_speed_duplex_m88;
		break;
	default:
		return -E1000_ERR_PHY;
		break;
	}

	return 0;
}

/**
 *  e1000_init_nvm_params_ich8lan - Initialize NVM function pointers
 *  @hw: pointer to the HW structure
 *
 *  Initialize family-specific NVM parameters and function
 *  pointers.
 **/
static s32 e1000_init_nvm_params_ich8lan(struct e1000_hw *hw)
{
	struct e1000_nvm_info *nvm = &hw->nvm;
	struct e1000_dev_spec_ich8lan *dev_spec = &hw->dev_spec.ich8lan;
	u32 gfpreg, sector_base_addr, sector_end_addr;
	u16 i;

	/* Can't read flash registers if the register set isn't mapped. */
	if (!hw->flash_address) {
		e_dbg("ERROR: Flash registers not mapped\n");
		return -E1000_ERR_CONFIG;
	}

	nvm->type = e1000_nvm_flash_sw;

	gfpreg = er32flash(ICH_FLASH_GFPREG);

	/* sector_X_addr is a "sector"-aligned address (4096 bytes)
	 * Add 1 to sector_end_addr since this sector is included in
	 * the overall size.
	 */
	sector_base_addr = gfpreg & FLASH_GFPREG_BASE_MASK;
	sector_end_addr = ((gfpreg >> 16) & FLASH_GFPREG_BASE_MASK) + 1;

	/* flash_base_addr is byte-aligned */
	nvm->flash_base_addr = sector_base_addr << FLASH_SECTOR_ADDR_SHIFT;

	/* find total size of the NVM, then cut in half since the total
	 * size represents two separate NVM banks.
	 */
	nvm->flash_bank_size = (sector_end_addr - sector_base_addr)
				<< FLASH_SECTOR_ADDR_SHIFT;
	nvm->flash_bank_size /= 2;
	/* Adjust to word count */
	nvm->flash_bank_size /= sizeof(u16);

	nvm->word_size = E1000_ICH8_SHADOW_RAM_WORDS;

	/* Clear shadow ram */
	for (i = 0; i < nvm->word_size; i++) {
		dev_spec->shadow_ram[i].modified = false;
		dev_spec->shadow_ram[i].value    = 0xFFFF;
	}

	return 0;
}

/**
 *  e1000_init_mac_params_ich8lan - Initialize MAC function pointers
 *  @hw: pointer to the HW structure
 *
 *  Initialize family-specific MAC parameters and function
 *  pointers.
 **/
static s32 e1000_init_mac_params_ich8lan(struct e1000_hw *hw)
{
	struct e1000_mac_info *mac = &hw->mac;

	/* Set media type function pointer */
	hw->phy.media_type = e1000_media_type_copper;

	/* Set mta register count */
	mac->mta_reg_count = 32;
	/* Set rar entry count */
	mac->rar_entry_count = E1000_ICH_RAR_ENTRIES;
	if (mac->type == e1000_ich8lan)
		mac->rar_entry_count--;
	/* FWSM register */
	mac->has_fwsm = true;
	/* ARC subsystem not supported */
	mac->arc_subsystem_valid = false;
	/* Adaptive IFS supported */
	mac->adaptive_ifs = true;

	/* LED and other operations */
	switch (mac->type) {
	case e1000_ich8lan:
	case e1000_ich9lan:
	case e1000_ich10lan:
		/* check management mode */
		mac->ops.check_mng_mode = e1000_check_mng_mode_ich8lan;
		/* ID LED init */
		mac->ops.id_led_init = e1000e_id_led_init_generic;
		/* blink LED */
		mac->ops.blink_led = e1000e_blink_led_generic;
		/* setup LED */
		mac->ops.setup_led = e1000e_setup_led_generic;
		/* cleanup LED */
		mac->ops.cleanup_led = e1000_cleanup_led_ich8lan;
		/* turn on/off LED */
		mac->ops.led_on = e1000_led_on_ich8lan;
		mac->ops.led_off = e1000_led_off_ich8lan;
		break;
	case e1000_pch2lan:
		mac->rar_entry_count = E1000_PCH2_RAR_ENTRIES;
		mac->ops.rar_set = e1000_rar_set_pch2lan;
		/* fall-through */
	case e1000_pch_lpt:
	case e1000_pchlan:
		/* check management mode */
		mac->ops.check_mng_mode = e1000_check_mng_mode_pchlan;
		/* ID LED init */
		mac->ops.id_led_init = e1000_id_led_init_pchlan;
		/* setup LED */
		mac->ops.setup_led = e1000_setup_led_pchlan;
		/* cleanup LED */
		mac->ops.cleanup_led = e1000_cleanup_led_pchlan;
		/* turn on/off LED */
		mac->ops.led_on = e1000_led_on_pchlan;
		mac->ops.led_off = e1000_led_off_pchlan;
		break;
	default:
		break;
	}

	if (mac->type == e1000_pch_lpt) {
		mac->rar_entry_count = E1000_PCH_LPT_RAR_ENTRIES;
		mac->ops.rar_set = e1000_rar_set_pch_lpt;
	}

	/* Enable PCS Lock-loss workaround for ICH8 */
	if (mac->type == e1000_ich8lan)
		e1000e_set_kmrn_lock_loss_workaround_ich8lan(hw, true);

	return 0;
}

/**
 *  __e1000_access_emi_reg_locked - 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
 *
 *  This helper function assumes the SW/FW/HW Semaphore is already acquired.
 **/
static s32 __e1000_access_emi_reg_locked(struct e1000_hw *hw, u16 address,
					 u16 *data, bool read)
{
	s32 ret_val;

	ret_val = e1e_wphy_locked(hw, I82579_EMI_ADDR, address);
	if (ret_val)
		return ret_val;

	if (read)
		ret_val = e1e_rphy_locked(hw, I82579_EMI_DATA, data);
	else
		ret_val = e1e_wphy_locked(hw, I82579_EMI_DATA, *data);

	return ret_val;
}

/**
 *  e1000_read_emi_reg_locked - 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
 *
 *  Assumes the SW/FW/HW Semaphore is already acquired.
 **/
s32 e1000_read_emi_reg_locked(struct e1000_hw *hw, u16 addr, u16 *data)
{
	return __e1000_access_emi_reg_locked(hw, addr, data, true);
}

/**
 *  e1000_write_emi_reg_locked - Write Extended Management Interface register
 *  @hw: pointer to the HW structure
 *  @addr: EMI address to program
 *  @data: value to be written to the EMI address
 *
 *  Assumes the SW/FW/HW Semaphore is already acquired.
 **/
static s32 e1000_write_emi_reg_locked(struct e1000_hw *hw, u16 addr, u16 data)
{
	return __e1000_access_emi_reg_locked(hw, addr, &data, false);
}

/**
 *  e1000_set_eee_pchlan - Enable/disable EEE support
 *  @hw: pointer to the HW structure
 *
 *  Enable/disable EEE based on setting in dev_spec structure, the duplex of
 *  the link and the EEE capabilities of the link partner.  The LPI Control
 *  register bits will remain set only if/when link is up.
 **/
static s32 e1000_set_eee_pchlan(struct e1000_hw *hw)
{
	struct e1000_dev_spec_ich8lan *dev_spec = &hw->dev_spec.ich8lan;
	s32 ret_val;
	u16 lpi_ctrl;

	if ((hw->phy.type != e1000_phy_82579) &&
	    (hw->phy.type != e1000_phy_i217))
		return 0;

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

	ret_val = e1e_rphy_locked(hw, I82579_LPI_CTRL, &lpi_ctrl);
	if (ret_val)
		goto release;

	/* Clear bits that enable EEE in various speeds */
	lpi_ctrl &= ~I82579_LPI_CTRL_ENABLE_MASK;

	/* Enable EEE if not disabled by user */
	if (!dev_spec->eee_disable) {
		u16 lpa, pcs_status, data;

		/* Save off link partner's EEE ability */
		switch (hw->phy.type) {
		case e1000_phy_82579:
			lpa = I82579_EEE_LP_ABILITY;
			pcs_status = I82579_EEE_PCS_STATUS;
			break;
		case e1000_phy_i217:
			lpa = I217_EEE_LP_ABILITY;
			pcs_status = I217_EEE_PCS_STATUS;
			break;
		default:
			ret_val = -E1000_ERR_PHY;
			goto release;
		}
		ret_val = e1000_read_emi_reg_locked(hw, lpa,
						    &dev_spec->eee_lp_ability);
		if (ret_val)
			goto release;

		/* Enable EEE only for speeds in which the link partner is
		 * EEE capable.
		 */
		if (dev_spec->eee_lp_ability & I82579_EEE_1000_SUPPORTED)
			lpi_ctrl |= I82579_LPI_CTRL_1000_ENABLE;

		if (dev_spec->eee_lp_ability & I82579_EEE_100_SUPPORTED) {
			e1e_rphy_locked(hw, PHY_LP_ABILITY, &data);
			if (data & NWAY_LPAR_100TX_FD_CAPS)
				lpi_ctrl |= I82579_LPI_CTRL_100_ENABLE;
			else
				/* EEE is not supported in 100Half, so ignore
				 * partner's EEE in 100 ability if full-duplex
				 * is not advertised.
				 */
				dev_spec->eee_lp_ability &=
				    ~I82579_EEE_100_SUPPORTED;
		}

		/* R/Clr IEEE MMD 3.1 bits 11:10 - Tx/Rx LPI Received */
		ret_val = e1000_read_emi_reg_locked(hw, pcs_status, &data);
		if (ret_val)
			goto release;
	}

	ret_val = e1e_wphy_locked(hw, I82579_LPI_CTRL, lpi_ctrl);
release:
	hw->phy.ops.release(hw);

	return ret_val;
}

/**
 *  e1000_check_for_copper_link_ich8lan - Check for link (Copper)
 *  @hw: pointer to the HW structure
 *
 *  Checks to see of the link status of the hardware has changed.  If a
 *  change in link status has been detected, then we read the PHY registers
 *  to get the current speed/duplex if link exists.
 **/
static s32 e1000_check_for_copper_link_ich8lan(struct e1000_hw *hw)
{
	struct e1000_mac_info *mac = &hw->mac;
	s32 ret_val;
	bool link;
	u16 phy_reg;

	/* We only want to go out to the PHY registers to see if Auto-Neg
	 * has completed and/or if our link status has changed.  The
	 * get_link_status flag is set upon receiving a Link Status
	 * Change or Rx Sequence Error interrupt.
	 */
	if (!mac->get_link_status)
		return 0;

	/* First we want to see if the MII Status Register reports
	 * link.  If so, then we want to get the current speed/duplex
	 * of the PHY.
	 */
	ret_val = e1000e_phy_has_link_generic(hw, 1, 0, &link);
	if (ret_val)
		return ret_val;

	if (hw->mac.type == e1000_pchlan) {
		ret_val = e1000_k1_gig_workaround_hv(hw, link);
		if (ret_val)
			return ret_val;
	}

	/* Clear link partner's EEE ability */
	hw->dev_spec.ich8lan.eee_lp_ability = 0;

	if (!link)
		return 0; /* No link detected */

	mac->get_link_status = false;

	switch (hw->mac.type) {
	case e1000_pch2lan:
		ret_val = e1000_k1_workaround_lv(hw);
		if (ret_val)
			return ret_val;
		/* fall-thru */
	case e1000_pchlan:
		if (hw->phy.type == e1000_phy_82578) {
			ret_val = e1000_link_stall_workaround_hv(hw);
			if (ret_val)
				return ret_val;
		}

		/* Workaround for PCHx parts in half-duplex:
		 * Set the number of preambles removed from the packet
		 * when it is passed from the PHY to the MAC to prevent
		 * the MAC from misinterpreting the packet type.
		 */
		e1e_rphy(hw, HV_KMRN_FIFO_CTRLSTA, &phy_reg);
		phy_reg &= ~HV_KMRN_FIFO_CTRLSTA_PREAMBLE_MASK;

		if ((er32(STATUS) & E1000_STATUS_FD) != E1000_STATUS_FD)
			phy_reg |= (1 << HV_KMRN_FIFO_CTRLSTA_PREAMBLE_SHIFT);

		e1e_wphy(hw, HV_KMRN_FIFO_CTRLSTA, phy_reg);
		break;
	default:
		break;
	}

	/* Check if there was DownShift, must be checked
	 * immediately after link-up
	 */
	e1000e_check_downshift(hw);

	/* Enable/Disable EEE after link up */
	ret_val = e1000_set_eee_pchlan(hw);
	if (ret_val)
		return ret_val;

	/* If we are forcing speed/duplex, then we simply return since
	 * we have already determined whether we have link or not.
	 */
	if (!mac->autoneg)
		return -E1000_ERR_CONFIG;

	/* Auto-Neg is enabled.  Auto Speed Detection takes care
	 * of MAC speed/duplex configuration.  So we only need to
	 * configure Collision Distance in the MAC.
	 */
	mac->ops.config_collision_dist(hw);

	/* 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 = e1000e_config_fc_after_link_up(hw);
	if (ret_val)
		e_dbg("Error configuring flow control\n");

	return ret_val;
}

static s32 e1000_get_variants_ich8lan(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	s32 rc;

	rc = e1000_init_mac_params_ich8lan(hw);
	if (rc)
		return rc;

	rc = e1000_init_nvm_params_ich8lan(hw);
	if (rc)
		return rc;

	switch (hw->mac.type) {
	case e1000_ich8lan:
	case e1000_ich9lan:
	case e1000_ich10lan:
		rc = e1000_init_phy_params_ich8lan(hw);
		break;
	case e1000_pchlan:
	case e1000_pch2lan:
	case e1000_pch_lpt:
		rc = e1000_init_phy_params_pchlan(hw);
		break;
	default:
		break;
	}
	if (rc)
		return rc;

	/* Disable Jumbo Frame support on parts with Intel 10/100 PHY or
	 * on parts with MACsec enabled in NVM (reflected in CTRL_EXT).
	 */
	if ((adapter->hw.phy.type == e1000_phy_ife) ||
	    ((adapter->hw.mac.type >= e1000_pch2lan) &&
	     (!(er32(CTRL_EXT) & E1000_CTRL_EXT_LSECCK)))) {
		adapter->flags &= ~FLAG_HAS_JUMBO_FRAMES;
		adapter->max_hw_frame_size = ETH_FRAME_LEN + ETH_FCS_LEN;

		hw->mac.ops.blink_led = NULL;
	}

	if ((adapter->hw.mac.type == e1000_ich8lan) &&
	    (adapter->hw.phy.type != e1000_phy_ife))
		adapter->flags |= FLAG_LSC_GIG_SPEED_DROP;

	/* Enable workaround for 82579 w/ ME enabled */
	if ((adapter->hw.mac.type == e1000_pch2lan) &&
	    (er32(FWSM) & E1000_ICH_FWSM_FW_VALID))
		adapter->flags2 |= FLAG2_PCIM2PCI_ARBITER_WA;

	/* Disable EEE by default until IEEE802.3az spec is finalized */
	if (adapter->flags2 & FLAG2_HAS_EEE)
		adapter->hw.dev_spec.ich8lan.eee_disable = true;

	return 0;
}

static DEFINE_MUTEX(nvm_mutex);

/**
 *  e1000_acquire_nvm_ich8lan - Acquire NVM mutex
 *  @hw: pointer to the HW structure
 *
 *  Acquires the mutex for performing NVM operations.
 **/
static s32 e1000_acquire_nvm_ich8lan(struct e1000_hw *hw)
{
	mutex_lock(&nvm_mutex);

	return 0;
}

/**
 *  e1000_release_nvm_ich8lan - Release NVM mutex
 *  @hw: pointer to the HW structure
 *
 *  Releases the mutex used while performing NVM operations.
 **/
static void e1000_release_nvm_ich8lan(struct e1000_hw *hw)
{
	mutex_unlock(&nvm_mutex);
}

/**
 *  e1000_acquire_swflag_ich8lan - Acquire software control flag
 *  @hw: pointer to the HW structure
 *
 *  Acquires the software control flag for performing PHY and select
 *  MAC CSR accesses.
 **/
static s32 e1000_acquire_swflag_ich8lan(struct e1000_hw *hw)
{
	u32 extcnf_ctrl, timeout = PHY_CFG_TIMEOUT;
	s32 ret_val = 0;

	if (test_and_set_bit(__E1000_ACCESS_SHARED_RESOURCE,
			     &hw->adapter->state)) {
		e_dbg("contention for Phy access\n");
		return -E1000_ERR_PHY;
	}

	while (timeout) {
		extcnf_ctrl = er32(EXTCNF_CTRL);
		if (!(extcnf_ctrl & E1000_EXTCNF_CTRL_SWFLAG))
			break;

		mdelay(1);
		timeout--;
	}

	if (!timeout) {
		e_dbg("SW has already locked the resource.\n");
		ret_val = -E1000_ERR_CONFIG;
		goto out;
	}

	timeout = SW_FLAG_TIMEOUT;

	extcnf_ctrl |= E1000_EXTCNF_CTRL_SWFLAG;
	ew32(EXTCNF_CTRL, extcnf_ctrl);

	while (timeout) {
		extcnf_ctrl = er32(EXTCNF_CTRL);
		if (extcnf_ctrl & E1000_EXTCNF_CTRL_SWFLAG)
			break;

		mdelay(1);
		timeout--;
	}

	if (!timeout) {
		e_dbg("Failed to acquire the semaphore, FW or HW has it: FWSM=0x%8.8x EXTCNF_CTRL=0x%8.8x)\n",
		      er32(FWSM), extcnf_ctrl);
		extcnf_ctrl &= ~E1000_EXTCNF_CTRL_SWFLAG;
		ew32(EXTCNF_CTRL, extcnf_ctrl);
		ret_val = -E1000_ERR_CONFIG;
		goto out;
	}

out:
	if (ret_val)
		clear_bit(__E1000_ACCESS_SHARED_RESOURCE, &hw->adapter->state);

	return ret_val;
}

/**
 *  e1000_release_swflag_ich8lan - Release software control flag
 *  @hw: pointer to the HW structure
 *
 *  Releases the software control flag for performing PHY and select
 *  MAC CSR accesses.
 **/
static void e1000_release_swflag_ich8lan(struct e1000_hw *hw)
{
	u32 extcnf_ctrl;

	extcnf_ctrl = er32(EXTCNF_CTRL);

	if (extcnf_ctrl & E1000_EXTCNF_CTRL_SWFLAG) {
		extcnf_ctrl &= ~E1000_EXTCNF_CTRL_SWFLAG;
		ew32(EXTCNF_CTRL, extcnf_ctrl);
	} else {
		e_dbg("Semaphore unexpectedly released by sw/fw/hw\n");
	}

	clear_bit(__E1000_ACCESS_SHARED_RESOURCE, &hw->adapter->state);
}

/**
 *  e1000_check_mng_mode_ich8lan - Checks management mode
 *  @hw: pointer to the HW structure
 *
 *  This checks if the adapter has any manageability enabled.
 *  This is a function pointer entry point only called by read/write
 *  routines for the PHY and NVM parts.
 **/
static bool e1000_check_mng_mode_ich8lan(struct e1000_hw *hw)
{
	u32 fwsm;

	fwsm = er32(FWSM);
	return (fwsm & E1000_ICH_FWSM_FW_VALID) &&
	       ((fwsm & E1000_FWSM_MODE_MASK) ==
		(E1000_ICH_MNG_IAMT_MODE << E1000_FWSM_MODE_SHIFT));
}

/**
 *  e1000_check_mng_mode_pchlan - Checks management mode
 *  @hw: pointer to the HW structure
 *
 *  This checks if the adapter has iAMT enabled.
 *  This is a function pointer entry point only called by read/write
 *  routines for the PHY and NVM parts.
 **/
static bool e1000_check_mng_mode_pchlan(struct e1000_hw *hw)
{
	u32 fwsm;

	fwsm = er32(FWSM);
	return (fwsm & E1000_ICH_FWSM_FW_VALID) &&
	       (fwsm & (E1000_ICH_MNG_IAMT_MODE << E1000_FWSM_MODE_SHIFT));
}

/**
 *  e1000_rar_set_pch2lan - Set receive address register
 *  @hw: pointer to the HW structure
 *  @addr: pointer to the receive address
 *  @index: receive address array register
 *
 *  Sets the receive address array register at index to the address passed
 *  in by addr.  For 82579, RAR[0] is the base address register that is to
 *  contain the MAC address but RAR[1-6] are reserved for manageability (ME).
 *  Use SHRA[0-3] in place of those reserved for ME.
 **/
static void e1000_rar_set_pch2lan(struct e1000_hw *hw, u8 *addr, u32 index)
{
	u32 rar_low, rar_high;

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

	rar_high = ((u32)addr[4] | ((u32)addr[5] << 8));

	/* If MAC address zero, no need to set the AV bit */
	if (rar_low || rar_high)
		rar_high |= E1000_RAH_AV;

	if (index == 0) {
		ew32(RAL(index), rar_low);
		e1e_flush();
		ew32(RAH(index), rar_high);
		e1e_flush();
		return;
	}

	if (index < hw->mac.rar_entry_count) {
		s32 ret_val;

		ret_val = e1000_acquire_swflag_ich8lan(hw);
		if (ret_val)
			goto out;

		ew32(SHRAL(index - 1), rar_low);
		e1e_flush();
		ew32(SHRAH(index - 1), rar_high);
		e1e_flush();

		e1000_release_swflag_ich8lan(hw);

		/* verify the register updates */
		if ((er32(SHRAL(index - 1)) == rar_low) &&
		    (er32(SHRAH(index - 1)) == rar_high))
			return;

		e_dbg("SHRA[%d] might be locked by ME - FWSM=0x%8.8x\n",
		      (index - 1), er32(FWSM));
	}

out:
	e_dbg("Failed to write receive address at index %d\n", index);
}

/**
 *  e1000_rar_set_pch_lpt - Set receive address registers
 *  @hw: pointer to the HW structure
 *  @addr: pointer to the receive address
 *  @index: receive address array register
 *
 *  Sets the receive address register array at index to the address passed
 *  in by addr. For LPT, RAR[0] is the base address register that is to
 *  contain the MAC address. SHRA[0-10] are the shared receive address
 *  registers that are shared between the Host and manageability engine (ME).
 **/
static void e1000_rar_set_pch_lpt(struct e1000_hw *hw, u8 *addr, u32 index)
{
	u32 rar_low, rar_high;
	u32 wlock_mac;

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

	rar_high = ((u32)addr[4] | ((u32)addr[5] << 8));

	/* If MAC address zero, no need to set the AV bit */
	if (rar_low || rar_high)
		rar_high |= E1000_RAH_AV;

	if (index == 0) {
		ew32(RAL(index), rar_low);
		e1e_flush();
		ew32(RAH(index), rar_high);
		e1e_flush();
		return;
	}

	/* The manageability engine (ME) can lock certain SHRAR registers that
	 * it is using - those registers are unavailable for use.
	 */
	if (index < hw->mac.rar_entry_count) {
		wlock_mac = er32(FWSM) & E1000_FWSM_WLOCK_MAC_MASK;
		wlock_mac >>= E1000_FWSM_WLOCK_MAC_SHIFT;

		/* Check if all SHRAR registers are locked */
		if (wlock_mac == 1)
			goto out;

		if ((wlock_mac == 0) || (index <= wlock_mac)) {
			s32 ret_val;

			ret_val = e1000_acquire_swflag_ich8lan(hw);

			if (ret_val)
				goto out;

			ew32(SHRAL_PCH_LPT(index - 1), rar_low);
			e1e_flush();
			ew32(SHRAH_PCH_LPT(index - 1), rar_high);
			e1e_flush();

			e1000_release_swflag_ich8lan(hw);

			/* verify the register updates */
			if ((er32(SHRAL_PCH_LPT(index - 1)) == rar_low) &&
			    (er32(SHRAH_PCH_LPT(index - 1)) == rar_high))
				return;
		}
	}

out:
	e_dbg("Failed to write receive address at index %d\n", index);
}

/**
 *  e1000_check_reset_block_ich8lan - Check if PHY reset is blocked
 *  @hw: pointer to the HW structure
 *
 *  Checks if firmware is blocking the reset of the PHY.
 *  This is a function pointer entry point only called by
 *  reset routines.
 **/
static s32 e1000_check_reset_block_ich8lan(struct e1000_hw *hw)
{
	u32 fwsm;

	fwsm = er32(FWSM);

	return (fwsm & E1000_ICH_FWSM_RSPCIPHY) ? 0 : E1000_BLK_PHY_RESET;
}

/**
 *  e1000_write_smbus_addr - Write SMBus address to PHY needed during Sx states
 *  @hw: pointer to the HW structure
 *
 *  Assumes semaphore already acquired.
 *
 **/
static s32 e1000_write_smbus_addr(struct e1000_hw *hw)
{
	u16 phy_data;
	u32 strap = er32(STRAP);
	u32 freq = (strap & E1000_STRAP_SMT_FREQ_MASK) >>
	    E1000_STRAP_SMT_FREQ_SHIFT;
	s32 ret_val;

	strap &= E1000_STRAP_SMBUS_ADDRESS_MASK;

	ret_val = e1000_read_phy_reg_hv_locked(hw, HV_SMB_ADDR, &phy_data);
	if (ret_val)
		return ret_val;

	phy_data &= ~HV_SMB_ADDR_MASK;
	phy_data |= (strap >> E1000_STRAP_SMBUS_ADDRESS_SHIFT);
	phy_data |= HV_SMB_ADDR_PEC_EN | HV_SMB_ADDR_VALID;

	if (hw->phy.type == e1000_phy_i217) {
		/* Restore SMBus frequency */
		if (freq--) {
			phy_data