e1000e: reformat comment blocks, cosmetic changes only

[safe/jmp/linux-2.6] / drivers / net / e1000e / lib.c

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

  Intel PRO/1000 Linux driver
  Copyright(c) 1999 - 2008 Intel Corporation.

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

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

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

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

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

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

#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/delay.h>
#include <linux/pci.h>

#include "e1000.h"

enum e1000_mng_mode {
        e1000_mng_mode_none = 0,
        e1000_mng_mode_asf,
        e1000_mng_mode_pt,
        e1000_mng_mode_ipmi,
        e1000_mng_mode_host_if_only
};

#define E1000_FACTPS_MNGCG              0x20000000

/* Intel(R) Active Management Technology signature */
#define E1000_IAMT_SIGNATURE            0x544D4149

/**
 *  e1000e_get_bus_info_pcie - Get PCIe bus information
 *  @hw: pointer to the HW structure
 *
 *  Determines and stores the system bus information for a particular
 *  network interface.  The following bus information is determined and stored:
 *  bus speed, bus width, type (PCIe), and PCIe function.
 **/
s32 e1000e_get_bus_info_pcie(struct e1000_hw *hw)
{
        struct e1000_bus_info *bus = &hw->bus;
        struct e1000_adapter *adapter = hw->adapter;
        u32 status;
        u16 pcie_link_status, pci_header_type, cap_offset;

        cap_offset = pci_find_capability(adapter->pdev, PCI_CAP_ID_EXP);
        if (!cap_offset) {
                bus->width = e1000_bus_width_unknown;
        } else {
                pci_read_config_word(adapter->pdev,
                                     cap_offset + PCIE_LINK_STATUS,
                                     &pcie_link_status);
                bus->width = (enum e1000_bus_width)((pcie_link_status &
                                                     PCIE_LINK_WIDTH_MASK) >>
                                                    PCIE_LINK_WIDTH_SHIFT);
        }

        pci_read_config_word(adapter->pdev, PCI_HEADER_TYPE_REGISTER,
                             &pci_header_type);
        if (pci_header_type & PCI_HEADER_TYPE_MULTIFUNC) {
                status = er32(STATUS);
                bus->func = (status & E1000_STATUS_FUNC_MASK)
                            >> E1000_STATUS_FUNC_SHIFT;
        } else {
                bus->func = 0;
        }

        return 0;
}

/**
 *  e1000e_write_vfta - 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 e1000e_write_vfta(struct e1000_hw *hw, u32 offset, u32 value)
{
        E1000_WRITE_REG_ARRAY(hw, E1000_VFTA, offset, value);
        e1e_flush();
}

/**
 *  e1000e_init_rx_addrs - Initialize receive address's
 *  @hw: pointer to the HW structure
 *  @rar_count: receive address registers
 *
 *  Setups the receive address registers by setting the base receive address
 *  register to the devices MAC address and clearing all the other receive
 *  address registers to 0.
 **/
void e1000e_init_rx_addrs(struct e1000_hw *hw, u16 rar_count)
{
        u32 i;

        /* Setup the receive address */
        hw_dbg(hw, "Programming MAC Address into RAR[0]\n");

        e1000e_rar_set(hw, hw->mac.addr, 0);

        /* Zero out the other (rar_entry_count - 1) receive addresses */
        hw_dbg(hw, "Clearing RAR[1-%u]\n", rar_count-1);
        for (i = 1; i < rar_count; i++) {
                E1000_WRITE_REG_ARRAY(hw, E1000_RA, (i << 1), 0);
                e1e_flush();
                E1000_WRITE_REG_ARRAY(hw, E1000_RA, ((i << 1) + 1), 0);
                e1e_flush();
        }
}

/**
 *  e1000e_rar_set - 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.
 **/
void e1000e_rar_set(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));

        rar_high |= E1000_RAH_AV;

        E1000_WRITE_REG_ARRAY(hw, E1000_RA, (index << 1), rar_low);
        E1000_WRITE_REG_ARRAY(hw, E1000_RA, ((index << 1) + 1), rar_high);
}

/**
 *  e1000_mta_set - Set multicast filter table address
 *  @hw: pointer to the HW structure
 *  @hash_value: determines the MTA register and bit to set
 *
 *  The multicast table address is a register array of 32-bit registers.
 *  The hash_value is used to determine what register the bit is in, the
 *  current value is read, the new bit is OR'd in and the new value is
 *  written back into the register.
 **/
static void e1000_mta_set(struct e1000_hw *hw, u32 hash_value)
{
        u32 hash_bit, hash_reg, mta;

        /*
         * The MTA is a register array of 32-bit registers. It is
         * treated like an array of (32*mta_reg_count) bits.  We want to
         * set bit BitArray[hash_value]. So we figure out what register
         * the bit is in, read it, OR in the new bit, then write
         * back the new value.  The (hw->mac.mta_reg_count - 1) serves as a
         * mask to bits 31:5 of the hash value which gives us the
         * register we're modifying.  The hash bit within that register
         * is determined by the lower 5 bits of the hash value.
         */
        hash_reg = (hash_value >> 5) & (hw->mac.mta_reg_count - 1);
        hash_bit = hash_value & 0x1F;

        mta = E1000_READ_REG_ARRAY(hw, E1000_MTA, hash_reg);

        mta |= (1 << hash_bit);

        E1000_WRITE_REG_ARRAY(hw, E1000_MTA, hash_reg, mta);
        e1e_flush();
}

/**
 *  e1000_hash_mc_addr - Generate a multicast hash value
 *  @hw: pointer to the HW structure
 *  @mc_addr: pointer to a multicast address
 *
 *  Generates a multicast address hash value which is used to determine
 *  the multicast filter table array address and new table value.  See
 *  e1000_mta_set_generic()
 **/
static u32 e1000_hash_mc_addr(struct e1000_hw *hw, u8 *mc_addr)
{
        u32 hash_value, hash_mask;
        u8 bit_shift = 0;

        /* Register count multiplied by bits per register */
        hash_mask = (hw->mac.mta_reg_count * 32) - 1;

        /*
         * For a mc_filter_type of 0, bit_shift is the number of left-shifts
         * where 0xFF would still fall within the hash mask.
         */
        while (hash_mask >> bit_shift != 0xFF)
                bit_shift++;

        /*
         * The portion of the address that is used for the hash table
         * is determined by the mc_filter_type setting.
         * The algorithm is such that there is a total of 8 bits of shifting.
         * The bit_shift for a mc_filter_type of 0 represents the number of
         * left-shifts where the MSB of mc_addr[5] would still fall within
         * the hash_mask.  Case 0 does this exactly.  Since there are a total
         * of 8 bits of shifting, then mc_addr[4] will shift right the
         * remaining number of bits. Thus 8 - bit_shift.  The rest of the
         * cases are a variation of this algorithm...essentially raising the
         * number of bits to shift mc_addr[5] left, while still keeping the
         * 8-bit shifting total.
         *
         * For example, given the following Destination MAC Address and an
         * mta register count of 128 (thus a 4096-bit vector and 0xFFF mask),
         * we can see that the bit_shift for case 0 is 4.  These are the hash
         * values resulting from each mc_filter_type...
         * [0] [1] [2] [3] [4] [5]
         * 01  AA  00  12  34  56
         * LSB           MSB
         *
         * case 0: hash_value = ((0x34 >> 4) | (0x56 << 4)) & 0xFFF = 0x563
         * case 1: hash_value = ((0x34 >> 3) | (0x56 << 5)) & 0xFFF = 0xAC6
         * case 2: hash_value = ((0x34 >> 2) | (0x56 << 6)) & 0xFFF = 0x163
         * case 3: hash_value = ((0x34 >> 0) | (0x56 << 8)) & 0xFFF = 0x634
         */
        switch (hw->mac.mc_filter_type) {
        default:
        case 0:
                break;
        case 1:
                bit_shift += 1;
                break;
        case 2:
                bit_shift += 2;
                break;
        case 3:
                bit_shift += 4;
                break;
        }

        hash_value = hash_mask & (((mc_addr[4] >> (8 - bit_shift)) |
                                  (((u16) mc_addr[5]) << bit_shift)));

        return hash_value;
}

/**
 *  e1000e_mc_addr_list_update_generic - Update Multicast addresses
 *  @hw: pointer to the HW structure
 *  @mc_addr_list: array of multicast addresses to program
 *  @mc_addr_count: number of multicast addresses to program
 *  @rar_used_count: the first RAR register free to program
 *  @rar_count: total number of supported Receive Address Registers
 *
 *  Updates the Receive Address Registers and Multicast Table Array.
 *  The caller must have a packed mc_addr_list of multicast addresses.
 *  The parameter rar_count will usually be hw->mac.rar_entry_count
 *  unless there are workarounds that change this.
 **/
void e1000e_mc_addr_list_update_generic(struct e1000_hw *hw,
                                       u8 *mc_addr_list, u32 mc_addr_count,
                                       u32 rar_used_count, u32 rar_count)
{
        u32 hash_value;
        u32 i;

        /*
         * Load the first set of multicast addresses into the exact
         * filters (RAR).  If there are not enough to fill the RAR
         * array, clear the filters.
         */
        for (i = rar_used_count; i < rar_count; i++) {
                if (mc_addr_count) {
                        e1000e_rar_set(hw, mc_addr_list, i);
                        mc_addr_count--;
                        mc_addr_list += ETH_ALEN;
                } else {
                        E1000_WRITE_REG_ARRAY(hw, E1000_RA, i << 1, 0);
                        e1e_flush();
                        E1000_WRITE_REG_ARRAY(hw, E1000_RA, (i << 1) + 1, 0);
                        e1e_flush();
                }
        }

        /* Clear the old settings from the MTA */
        hw_dbg(hw, "Clearing MTA\n");
        for (i = 0; i < hw->mac.mta_reg_count; i++) {
                E1000_WRITE_REG_ARRAY(hw, E1000_MTA, i, 0);
                e1e_flush();
        }

        /* Load any remaining multicast addresses into the hash table. */
        for (; mc_addr_count > 0; mc_addr_count--) {
                hash_value = e1000_hash_mc_addr(hw, mc_addr_list);
                hw_dbg(hw, "Hash value = 0x%03X\n", hash_value);
                e1000_mta_set(hw, hash_value);
                mc_addr_list += ETH_ALEN;
        }
}

/**
 *  e1000e_clear_hw_cntrs_base - Clear base hardware counters
 *  @hw: pointer to the HW structure
 *
 *  Clears the base hardware counters by reading the counter registers.
 **/
void e1000e_clear_hw_cntrs_base(struct e1000_hw *hw)
{
        u32 temp;

        temp = er32(CRCERRS);
        temp = er32(SYMERRS);
        temp = er32(MPC);
        temp = er32(SCC);
        temp = er32(ECOL);
        temp = er32(MCC);
        temp = er32(LATECOL);
        temp = er32(COLC);
        temp = er32(DC);
        temp = er32(SEC);
        temp = er32(RLEC);
        temp = er32(XONRXC);
        temp = er32(XONTXC);
        temp = er32(XOFFRXC);
        temp = er32(XOFFTXC);
        temp = er32(FCRUC);
        temp = er32(GPRC);
        temp = er32(BPRC);
        temp = er32(MPRC);
        temp = er32(GPTC);
        temp = er32(GORCL);
        temp = er32(GORCH);
        temp = er32(GOTCL);
        temp = er32(GOTCH);
        temp = er32(RNBC);
        temp = er32(RUC);
        temp = er32(RFC);
        temp = er32(ROC);
        temp = er32(RJC);
        temp = er32(TORL);
        temp = er32(TORH);
        temp = er32(TOTL);
        temp = er32(TOTH);
        temp = er32(TPR);
        temp = er32(TPT);
        temp = er32(MPTC);
        temp = er32(BPTC);
}

/**
 *  e1000e_check_for_copper_link - 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.
 **/
s32 e1000e_check_for_copper_link(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        s32 ret_val;
        bool link;

        /*
         * 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 (!link)
                return ret_val; /* No link detected */

        mac->get_link_status = 0;

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

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

        /*
         * 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.
         */
        e1000e_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) {
                hw_dbg(hw, "Error configuring flow control\n");
        }

        return ret_val;
}

/**
 *  e1000e_check_for_fiber_link - Check for link (Fiber)
 *  @hw: pointer to the HW structure
 *
 *  Checks for link up on the hardware.  If link is not up and we have
 *  a signal, then we need to force link up.
 **/
s32 e1000e_check_for_fiber_link(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        u32 rxcw;
        u32 ctrl;
        u32 status;
        s32 ret_val;

        ctrl = er32(CTRL);
        status = er32(STATUS);
        rxcw = er32(RXCW);

        /*
         * If we don't have link (auto-negotiation failed or link partner
         * cannot auto-negotiate), the cable is plugged in (we have signal),
         * and our link partner is not trying to auto-negotiate with us (we
         * are receiving idles or data), we need to force link up. We also
         * need to give auto-negotiation time to complete, in case the cable
         * was just plugged in. The autoneg_failed flag does this.
         */
        /* (ctrl & E1000_CTRL_SWDPIN1) == 1 == have signal */
        if ((ctrl & E1000_CTRL_SWDPIN1) && (!(status & E1000_STATUS_LU)) &&
            (!(rxcw & E1000_RXCW_C))) {
                if (mac->autoneg_failed == 0) {
                        mac->autoneg_failed = 1;
                        return 0;
                }
                hw_dbg(hw, "NOT RXing /C/, disable AutoNeg and force link.\n");

                /* Disable auto-negotiation in the TXCW register */
                ew32(TXCW, (mac->txcw & ~E1000_TXCW_ANE));

                /* Force link-up and also force full-duplex. */
                ctrl = er32(CTRL);
                ctrl |= (E1000_CTRL_SLU | E1000_CTRL_FD);
                ew32(CTRL, ctrl);

                /* Configure Flow Control after forcing link up. */
                ret_val = e1000e_config_fc_after_link_up(hw);
                if (ret_val) {
                        hw_dbg(hw, "Error configuring flow control\n");
                        return ret_val;
                }
        } else if ((ctrl & E1000_CTRL_SLU) && (rxcw & E1000_RXCW_C)) {
                /*
                 * If we are forcing link and we are receiving /C/ ordered
                 * sets, re-enable auto-negotiation in the TXCW register
                 * and disable forced link in the Device Control register
                 * in an attempt to auto-negotiate with our link partner.
                 */
                hw_dbg(hw, "RXing /C/, enable AutoNeg and stop forcing link.\n");
                ew32(TXCW, mac->txcw);
                ew32(CTRL, (ctrl & ~E1000_CTRL_SLU));

                mac->serdes_has_link = 1;
        }

        return 0;
}

/**
 *  e1000e_check_for_serdes_link - Check for link (Serdes)
 *  @hw: pointer to the HW structure
 *
 *  Checks for link up on the hardware.  If link is not up and we have
 *  a signal, then we need to force link up.
 **/
s32 e1000e_check_for_serdes_link(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        u32 rxcw;
        u32 ctrl;
        u32 status;
        s32 ret_val;

        ctrl = er32(CTRL);
        status = er32(STATUS);
        rxcw = er32(RXCW);

        /*
         * If we don't have link (auto-negotiation failed or link partner
         * cannot auto-negotiate), and our link partner is not trying to
         * auto-negotiate with us (we are receiving idles or data),
         * we need to force link up. We also need to give auto-negotiation
         * time to complete.
         */
        /* (ctrl & E1000_CTRL_SWDPIN1) == 1 == have signal */
        if ((!(status & E1000_STATUS_LU)) && (!(rxcw & E1000_RXCW_C))) {
                if (mac->autoneg_failed == 0) {
                        mac->autoneg_failed = 1;
                        return 0;
                }
                hw_dbg(hw, "NOT RXing /C/, disable AutoNeg and force link.\n");

                /* Disable auto-negotiation in the TXCW register */
                ew32(TXCW, (mac->txcw & ~E1000_TXCW_ANE));

                /* Force link-up and also force full-duplex. */
                ctrl = er32(CTRL);
                ctrl |= (E1000_CTRL_SLU | E1000_CTRL_FD);
                ew32(CTRL, ctrl);

                /* Configure Flow Control after forcing link up. */
                ret_val = e1000e_config_fc_after_link_up(hw);
                if (ret_val) {
                        hw_dbg(hw, "Error configuring flow control\n");
                        return ret_val;
                }
        } else if ((ctrl & E1000_CTRL_SLU) && (rxcw & E1000_RXCW_C)) {
                /*
                 * If we are forcing link and we are receiving /C/ ordered
                 * sets, re-enable auto-negotiation in the TXCW register
                 * and disable forced link in the Device Control register
                 * in an attempt to auto-negotiate with our link partner.
                 */
                hw_dbg(hw, "RXing /C/, enable AutoNeg and stop forcing link.\n");
                ew32(TXCW, mac->txcw);
                ew32(CTRL, (ctrl & ~E1000_CTRL_SLU));

                mac->serdes_has_link = 1;
        } else if (!(E1000_TXCW_ANE & er32(TXCW))) {
                /*
                 * If we force link for non-auto-negotiation switch, check
                 * link status based on MAC synchronization for internal
                 * serdes media type.
                 */
                /* SYNCH bit and IV bit are sticky. */
                udelay(10);
                if (E1000_RXCW_SYNCH & er32(RXCW)) {
                        if (!(rxcw & E1000_RXCW_IV)) {
                                mac->serdes_has_link = 1;
                                hw_dbg(hw, "SERDES: Link is up.\n");
                        }
                } else {
                        mac->serdes_has_link = 0;
                        hw_dbg(hw, "SERDES: Link is down.\n");
                }
        }

        if (E1000_TXCW_ANE & er32(TXCW)) {
                status = er32(STATUS);
                mac->serdes_has_link = (status & E1000_STATUS_LU);
        }

        return 0;
}

/**
 *  e1000_set_default_fc_generic - Set flow control default values
 *  @hw: pointer to the HW structure
 *
 *  Read the EEPROM for the default values for flow control and store the
 *  values.
 **/
static s32 e1000_set_default_fc_generic(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        s32 ret_val;
        u16 nvm_data;

        /*
         * Read and store word 0x0F of the EEPROM. This word contains bits
         * that determine the hardware's default PAUSE (flow control) mode,
         * a bit that determines whether the HW defaults to enabling or
         * disabling auto-negotiation, and the direction of the
         * SW defined pins. If there is no SW over-ride of the flow
         * control setting, then the variable hw->fc will
         * be initialized based on a value in the EEPROM.
         */
        ret_val = e1000_read_nvm(hw, NVM_INIT_CONTROL2_REG, 1, &nvm_data);

        if (ret_val) {
                hw_dbg(hw, "NVM Read Error\n");
                return ret_val;
        }

        if ((nvm_data & NVM_WORD0F_PAUSE_MASK) == 0)
                mac->fc = e1000_fc_none;
        else if ((nvm_data & NVM_WORD0F_PAUSE_MASK) ==
                 NVM_WORD0F_ASM_DIR)
                mac->fc = e1000_fc_tx_pause;
        else
                mac->fc = e1000_fc_full;

        return 0;
}

/**
 *  e1000e_setup_link - Setup flow control and link settings
 *  @hw: pointer to the HW structure
 *
 *  Determines which flow control settings to use, then configures flow
 *  control.  Calls the appropriate media-specific link configuration
 *  function.  Assuming the adapter has a valid link partner, a valid link
 *  should be established.  Assumes the hardware has previously been reset
 *  and the transmitter and receiver are not enabled.
 **/
s32 e1000e_setup_link(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        s32 ret_val;

        /*
         * In the case of the phy reset being blocked, we already have a link.
         * We do not need to set it up again.
         */
        if (e1000_check_reset_block(hw))
                return 0;

        /*
         * If flow control is set to default, set flow control based on
         * the EEPROM flow control settings.
         */
        if (mac->fc == e1000_fc_default) {
                ret_val = e1000_set_default_fc_generic(hw);
                if (ret_val)
                        return ret_val;
        }

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

        hw_dbg(hw, "After fix-ups FlowControl is now = %x\n", mac->fc);

        /* Call the necessary media_type subroutine to configure the link. */
        ret_val = mac->ops.setup_physical_interface(hw);
        if (ret_val)
                return ret_val;

        /*
         * Initialize the flow control address, type, and PAUSE timer
         * registers to their default values.  This is done even if flow
         * control is disabled, because it does not hurt anything to
         * initialize these registers.
         */
        hw_dbg(hw, "Initializing the Flow Control address, type and timer regs\n");
        ew32(FCT, FLOW_CONTROL_TYPE);
        ew32(FCAH, FLOW_CONTROL_ADDRESS_HIGH);
        ew32(FCAL, FLOW_CONTROL_ADDRESS_LOW);

        ew32(FCTTV, mac->fc_pause_time);

        return e1000e_set_fc_watermarks(hw);
}

/**
 *  e1000_commit_fc_settings_generic - Configure flow control
 *  @hw: pointer to the HW structure
 *
 *  Write the flow control settings to the Transmit Config Word Register (TXCW)
 *  base on the flow control settings in e1000_mac_info.
 **/
static s32 e1000_commit_fc_settings_generic(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        u32 txcw;

        /*
         * Check for a software override of the flow control settings, and
         * setup the device accordingly.  If auto-negotiation is enabled, then
         * software will have to set the "PAUSE" bits to the correct value in
         * the Transmit Config Word Register (TXCW) and re-start auto-
         * negotiation.  However, if auto-negotiation is disabled, then
         * software will have to manually configure the two flow control enable
         * bits in the CTRL register.
         *
         * The possible values of the "fc" parameter are:
         *      0:  Flow control is completely disabled
         *      1:  Rx flow control is enabled (we can receive pause frames,
         *        but not send pause frames).
         *      2:  Tx flow control is enabled (we can send pause frames but we
         *        do not support receiving pause frames).
         *      3:  Both Rx and Tx flow control (symmetric) are enabled.
         */
        switch (mac->fc) {
        case e1000_fc_none:
                /* Flow control completely disabled by a software over-ride. */
                txcw = (E1000_TXCW_ANE | E1000_TXCW_FD);
                break;
        case e1000_fc_rx_pause:
                /*
                 * Rx Flow control is enabled and Tx Flow control is disabled
                 * by a software over-ride. Since there really isn't a way to
                 * advertise that we are capable of Rx Pause ONLY, we will
                 * advertise that we support both symmetric and asymmetric Rx
                 * PAUSE.  Later, we will disable the adapter's ability to send
                 * PAUSE frames.
                 */
                txcw = (E1000_TXCW_ANE | E1000_TXCW_FD | E1000_TXCW_PAUSE_MASK);
                break;
        case e1000_fc_tx_pause:
                /*
                 * Tx Flow control is enabled, and Rx Flow control is disabled,
                 * by a software over-ride.
                 */
                txcw = (E1000_TXCW_ANE | E1000_TXCW_FD | E1000_TXCW_ASM_DIR);
                break;
        case e1000_fc_full:
                /*
                 * Flow control (both Rx and Tx) is enabled by a software
                 * over-ride.
                 */
                txcw = (E1000_TXCW_ANE | E1000_TXCW_FD | E1000_TXCW_PAUSE_MASK);
                break;
        default:
                hw_dbg(hw, "Flow control param set incorrectly\n");
                return -E1000_ERR_CONFIG;
                break;
        }

        ew32(TXCW, txcw);
        mac->txcw = txcw;

        return 0;
}

/**
 *  e1000_poll_fiber_serdes_link_generic - Poll for link up
 *  @hw: pointer to the HW structure
 *
 *  Polls for link up by reading the status register, if link fails to come
 *  up with auto-negotiation, then the link is forced if a signal is detected.
 **/
static s32 e1000_poll_fiber_serdes_link_generic(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        u32 i, status;
        s32 ret_val;

        /*
         * If we have a signal (the cable is plugged in, or assumed true for
         * serdes media) then poll for a "Link-Up" indication in the Device
         * Status Register.  Time-out if a link isn't seen in 500 milliseconds
         * seconds (Auto-negotiation should complete in less than 500
         * milliseconds even if the other end is doing it in SW).
         */
        for (i = 0; i < FIBER_LINK_UP_LIMIT; i++) {
                msleep(10);
                status = er32(STATUS);
                if (status & E1000_STATUS_LU)
                        break;
        }
        if (i == FIBER_LINK_UP_LIMIT) {
                hw_dbg(hw, "Never got a valid link from auto-neg!!!\n");
                mac->autoneg_failed = 1;
                /*
                 * AutoNeg failed to achieve a link, so we'll call
                 * mac->check_for_link. This routine will force the
                 * link up if we detect a signal. This will allow us to
                 * communicate with non-autonegotiating link partners.
                 */
                ret_val = mac->ops.check_for_link(hw);
                if (ret_val) {
                        hw_dbg(hw, "Error while checking for link\n");
                        return ret_val;
                }
                mac->autoneg_failed = 0;
        } else {
                mac->autoneg_failed = 0;
                hw_dbg(hw, "Valid Link Found\n");
        }

        return 0;
}

/**
 *  e1000e_setup_fiber_serdes_link - Setup link for fiber/serdes
 *  @hw: pointer to the HW structure
 *
 *  Configures collision distance and flow control for fiber and serdes
 *  links.  Upon successful setup, poll for link.
 **/
s32 e1000e_setup_fiber_serdes_link(struct e1000_hw *hw)
{
        u32 ctrl;
        s32 ret_val;

        ctrl = er32(CTRL);

        /* Take the link out of reset */
        ctrl &= ~E1000_CTRL_LRST;

        e1000e_config_collision_dist(hw);

        ret_val = e1000_commit_fc_settings_generic(hw);
        if (ret_val)
                return ret_val;

        /*
         * Since auto-negotiation is enabled, take the link out of reset (the
         * link will be in reset, because we previously reset the chip). This
         * will restart auto-negotiation.  If auto-negotiation is successful
         * then the link-up status bit will be set and the flow control enable
         * bits (RFCE and TFCE) will be set according to their negotiated value.
         */
        hw_dbg(hw, "Auto-negotiation enabled\n");

        ew32(CTRL, ctrl);
        e1e_flush();
        msleep(1);

        /*
         * For these adapters, the SW definable pin 1 is set when the optics
         * detect a signal.  If we have a signal, then poll for a "Link-Up"
         * indication.
         */
        if (hw->media_type == e1000_media_type_internal_serdes ||
            (er32(CTRL) & E1000_CTRL_SWDPIN1)) {
                ret_val = e1000_poll_fiber_serdes_link_generic(hw);
        } else {
                hw_dbg(hw, "No signal detected\n");
        }

        return 0;
}

/**
 *  e1000e_config_collision_dist - Configure collision distance
 *  @hw: pointer to the HW structure
 *
 *  Configures the collision distance to the default value and is used
 *  during link setup. Currently no func pointer exists and all
 *  implementations are handled in the generic version of this function.
 **/
void e1000e_config_collision_dist(struct e1000_hw *hw)
{
        u32 tctl;

        tctl = er32(TCTL);

        tctl &= ~E1000_TCTL_COLD;
        tctl |= E1000_COLLISION_DISTANCE << E1000_COLD_SHIFT;

        ew32(TCTL, tctl);
        e1e_flush();
}

/**
 *  e1000e_set_fc_watermarks - Set flow control high/low watermarks
 *  @hw: pointer to the HW structure
 *
 *  Sets the flow control high/low threshold (watermark) registers.  If
 *  flow control XON frame transmission is enabled, then set XON frame
 *  transmission as well.
 **/
s32 e1000e_set_fc_watermarks(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        u32 fcrtl = 0, fcrth = 0;

        /*
         * Set the flow control receive threshold registers.  Normally,
         * these registers will be set to a default threshold that may be
         * adjusted later by the driver's runtime code.  However, if the
         * ability to transmit pause frames is not enabled, then these
         * registers will be set to 0.
         */
        if (mac->fc & e1000_fc_tx_pause) {
                /*
                 * We need to set up the Receive Threshold high and low water
                 * marks as well as (optionally) enabling the transmission of
                 * XON frames.
                 */
                fcrtl = mac->fc_low_water;
                fcrtl |= E1000_FCRTL_XONE;
                fcrth = mac->fc_high_water;
        }
        ew32(FCRTL, fcrtl);
        ew32(FCRTH, fcrth);

        return 0;
}

/**
 *  e1000e_force_mac_fc - Force the MAC's flow control settings
 *  @hw: pointer to the HW structure
 *
 *  Force the MAC's flow control settings.  Sets the TFCE and RFCE bits in the
 *  device control register to reflect the adapter settings.  TFCE and RFCE
 *  need to be explicitly set by software when a copper PHY is used because
 *  autonegotiation is managed by the PHY rather than the MAC.  Software must
 *  also configure these bits when link is forced on a fiber connection.
 **/
s32 e1000e_force_mac_fc(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        u32 ctrl;

        ctrl = er32(CTRL);

        /*
         * Because we didn't get link via the internal auto-negotiation
         * mechanism (we either forced link or we got link via PHY
         * auto-neg), we have to manually enable/disable transmit an
         * receive flow control.
         *
         * The "Case" statement below enables/disable flow control
         * according to the "mac->fc" parameter.
         *
         * The possible values of the "fc" parameter are:
         *      0:  Flow control is completely disabled
         *      1:  Rx flow control is enabled (we can receive pause
         *        frames but not send pause frames).
         *      2:  Tx flow control is enabled (we can send pause frames
         *        frames but we do not receive pause frames).
         *      3:  Both Rx and Tx flow control (symmetric) is enabled.
         *  other:  No other values should be possible at this point.
         */
        hw_dbg(hw, "mac->fc = %u\n", mac->fc);

        switch (mac->fc) {
        case e1000_fc_none:
                ctrl &= (~(E1000_CTRL_TFCE | E1000_CTRL_RFCE));
                break;
        case e1000_fc_rx_pause:
                ctrl &= (~E1000_CTRL_TFCE);
                ctrl |= E1000_CTRL_RFCE;
                break;
        case e1000_fc_tx_pause:
                ctrl &= (~E1000_CTRL_RFCE);
                ctrl |= E1000_CTRL_TFCE;
                break;
        case e1000_fc_full:
                ctrl |= (E1000_CTRL_TFCE | E1000_CTRL_RFCE);
                break;
        default:
                hw_dbg(hw, "Flow control param set incorrectly\n");
                return -E1000_ERR_CONFIG;
        }

        ew32(CTRL, ctrl);

        return 0;
}

/**
 *  e1000e_config_fc_after_link_up - Configures flow control after link
 *  @hw: pointer to the HW structure
 *
 *  Checks the status of auto-negotiation after link up to ensure that the
 *  speed and duplex were not forced.  If the link needed to be forced, then
 *  flow control needs to be forced also.  If auto-negotiation is enabled
 *  and did not fail, then we configure flow control based on our link
 *  partner.
 **/
s32 e1000e_config_fc_after_link_up(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        s32 ret_val = 0;
        u16 mii_status_reg, mii_nway_adv_reg, mii_nway_lp_ability_reg;
        u16 speed, duplex;

        /*
         * Check for the case where we have fiber media and auto-neg failed
         * so we had to force link.  In this case, we need to force the
         * configuration of the MAC to match the "fc" parameter.
         */
        if (mac->autoneg_failed) {
                if (hw->media_type == e1000_media_type_fiber ||
                    hw->media_type == e1000_media_type_internal_serdes)
                        ret_val = e1000e_force_mac_fc(hw);
        } else {
                if (hw->media_type == e1000_media_type_copper)
                        ret_val = e1000e_force_mac_fc(hw);
        }

        if (ret_val) {
                hw_dbg(hw, "Error forcing flow control settings\n");
                return ret_val;
        }

        /*
         * Check for the case where we have copper media and auto-neg is
         * enabled.  In this case, we need to check and see if Auto-Neg
         * has completed, and if so, how the PHY and link partner has
         * flow control configured.
         */
        if ((hw->media_type == e1000_media_type_copper) && mac->autoneg) {
                /*
                 * Read the MII Status Register and check to see if AutoNeg
                 * has completed.  We read this twice because this reg has
                 * some "sticky" (latched) bits.
                 */
                ret_val = e1e_rphy(hw, PHY_STATUS, &mii_status_reg);
                if (ret_val)
                        return ret_val;
                ret_val = e1e_rphy(hw, PHY_STATUS, &mii_status_reg);
                if (ret_val)
                        return ret_val;

                if (!(mii_status_reg & MII_SR_AUTONEG_COMPLETE)) {
                        hw_dbg(hw, "Copper PHY and Auto Neg "
                                 "has not completed.\n");
                        return ret_val;
                }

                /*
                 * The AutoNeg process has completed, so we now need to
                 * read both the Auto Negotiation Advertisement
                 * Register (Address 4) and the Auto_Negotiation Base
                 * Page Ability Register (Address 5) to determine how
                 * flow control was negotiated.
                 */
                ret_val = e1e_rphy(hw, PHY_AUTONEG_ADV, &mii_nway_adv_reg);
                if (ret_val)
                        return ret_val;
                ret_val = e1e_rphy(hw, PHY_LP_ABILITY, &mii_nway_lp_ability_reg);
                if (ret_val)
                        return ret_val;

                /*
                 * Two bits in the Auto Negotiation Advertisement Register
                 * (Address 4) and two bits in the Auto Negotiation Base
                 * Page Ability Register (Address 5) determine flow control
                 * for both the PHY and the link partner.  The following
                 * table, taken out of the IEEE 802.3ab/D6.0 dated March 25,
                 * 1999, describes these PAUSE resolution bits and how flow
                 * control is determined based upon these settings.
                 * NOTE:  DC = Don't Care
                 *
                 *   LOCAL DEVICE  |   LINK PARTNER
                 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | NIC Resolution
                 *-------|---------|-------|---------|--------------------
                 *   0   |    0    |  DC   |   DC    | e1000_fc_none
                 *   0   |    1    |   0   |   DC    | e1000_fc_none
                 *   0   |    1    |   1   |    0    | e1000_fc_none
                 *   0   |    1    |   1   |    1    | e1000_fc_tx_pause
                 *   1   |    0    |   0   |   DC    | e1000_fc_none
                 *   1   |   DC    |   1   |   DC    | e1000_fc_full
                 *   1   |    1    |   0   |    0    | e1000_fc_none
                 *   1   |    1    |   0   |    1    | e1000_fc_rx_pause
                 *
                 *
                 * Are both PAUSE bits set to 1?  If so, this implies
                 * Symmetric Flow Control is enabled at both ends.  The
                 * ASM_DIR bits are irrelevant per the spec.
                 *
                 * For Symmetric Flow Control:
                 *
                 *   LOCAL DEVICE  |   LINK PARTNER
                 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | Result
                 *-------|---------|-------|---------|--------------------
                 *   1   |   DC    |   1   |   DC    | E1000_fc_full
                 *
                 */
                if ((mii_nway_adv_reg & NWAY_AR_PAUSE) &&
                    (mii_nway_lp_ability_reg & NWAY_LPAR_PAUSE)) {
                        /*
                         * Now we need to check if the user selected Rx ONLY
                         * of pause frames.  In this case, we had to advertise
                         * FULL flow control because we could not advertise Rx
                         * ONLY. Hence, we must now check to see if we need to
                         * turn OFF  the TRANSMISSION of PAUSE frames.
                         */
                        if (mac->original_fc == e1000_fc_full) {
                                mac->fc = e1000_fc_full;
                                hw_dbg(hw, "Flow Control = FULL.\r\n");
                        } else {
                                mac->fc = e1000_fc_rx_pause;
                                hw_dbg(hw, "Flow Control = "
                                         "RX PAUSE frames only.\r\n");
                        }
                }
                /*
                 * For receiving PAUSE frames ONLY.
                 *
                 *   LOCAL DEVICE  |   LINK PARTNER
                 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | Result
                 *-------|---------|-------|---------|--------------------
                 *   0   |    1    |   1   |    1    | e1000_fc_tx_pause
                 *
                 */
                else if (!(mii_nway_adv_reg & NWAY_AR_PAUSE) &&
                          (mii_nway_adv_reg & NWAY_AR_ASM_DIR) &&
                          (mii_nway_lp_ability_reg & NWAY_LPAR_PAUSE) &&
                          (mii_nway_lp_ability_reg & NWAY_LPAR_ASM_DIR)) {
                        mac->fc = e1000_fc_tx_pause;
                        hw_dbg(hw, "Flow Control = TX PAUSE frames only.\r\n");
                }
                /*
                 * For transmitting PAUSE frames ONLY.
                 *
                 *   LOCAL DEVICE  |   LINK PARTNER
                 * PAUSE | ASM_DIR | PAUSE | ASM_DIR | Result
                 *-------|---------|-------|---------|--------------------
                 *   1   |    1    |   0   |    1    | e1000_fc_rx_pause
                 *
                 */
                else if ((mii_nway_adv_reg & NWAY_AR_PAUSE) &&
                         (mii_nway_adv_reg & NWAY_AR_ASM_DIR) &&
                         !(mii_nway_lp_ability_reg & NWAY_LPAR_PAUSE) &&
                         (mii_nway_lp_ability_reg & NWAY_LPAR_ASM_DIR)) {
                        mac->fc = e1000_fc_rx_pause;
                        hw_dbg(hw, "Flow Control = RX PAUSE frames only.\r\n");
                } else {
                        /*
                         * Per the IEEE spec, at this point flow control
                         * should be disabled.
                         */
                        mac->fc = e1000_fc_none;
                        hw_dbg(hw, "Flow Control = NONE.\r\n");
                }

                /*
                 * Now we need to do one last check...  If we auto-
                 * negotiated to HALF DUPLEX, flow control should not be
                 * enabled per IEEE 802.3 spec.
                 */
                ret_val = mac->ops.get_link_up_info(hw, &speed, &duplex);
                if (ret_val) {
                        hw_dbg(hw, "Error getting link speed and duplex\n");
                        return ret_val;
                }

                if (duplex == HALF_DUPLEX)
                        mac->fc = e1000_fc_none;

                /*
                 * Now we call a subroutine to actually force the MAC
                 * controller to use the correct flow control settings.
                 */
                ret_val = e1000e_force_mac_fc(hw);
                if (ret_val) {
                        hw_dbg(hw, "Error forcing flow control settings\n");
                        return ret_val;
                }
        }

        return 0;
}

/**
 *  e1000e_get_speed_and_duplex_copper - Retrieve current speed/duplex
 *  @hw: pointer to the HW structure
 *  @speed: stores the current speed
 *  @duplex: stores the current duplex
 *
 *  Read the status register for the current speed/duplex and store the current
 *  speed and duplex for copper connections.
 **/
s32 e1000e_get_speed_and_duplex_copper(struct e1000_hw *hw, u16 *speed, u16 *duplex)
{
        u32 status;

        status = er32(STATUS);
        if (status & E1000_STATUS_SPEED_1000) {
                *speed = SPEED_1000;
                hw_dbg(hw, "1000 Mbs, ");
        } else if (status & E1000_STATUS_SPEED_100) {
                *speed = SPEED_100;
                hw_dbg(hw, "100 Mbs, ");
        } else {
                *speed = SPEED_10;
                hw_dbg(hw, "10 Mbs, ");
        }

        if (status & E1000_STATUS_FD) {
                *duplex = FULL_DUPLEX;
                hw_dbg(hw, "Full Duplex\n");
        } else {
                *duplex = HALF_DUPLEX;
                hw_dbg(hw, "Half Duplex\n");
        }

        return 0;
}

/**
 *  e1000e_get_speed_and_duplex_fiber_serdes - Retrieve current speed/duplex
 *  @hw: pointer to the HW structure
 *  @speed: stores the current speed
 *  @duplex: stores the current duplex
 *
 *  Sets the speed and duplex to gigabit full duplex (the only possible option)
 *  for fiber/serdes links.
 **/
s32 e1000e_get_speed_and_duplex_fiber_serdes(struct e1000_hw *hw, u16 *speed, u16 *duplex)
{
        *speed = SPEED_1000;
        *duplex = FULL_DUPLEX;

        return 0;
}

/**
 *  e1000e_get_hw_semaphore - Acquire hardware semaphore
 *  @hw: pointer to the HW structure
 *
 *  Acquire the HW semaphore to access the PHY or NVM
 **/
s32 e1000e_get_hw_semaphore(struct e1000_hw *hw)
{
        u32 swsm;
        s32 timeout = hw->nvm.word_size + 1;
        s32 i = 0;

        /* Get the SW semaphore */
        while (i < timeout) {
                swsm = er32(SWSM);
                if (!(swsm & E1000_SWSM_SMBI))
                        break;

                udelay(50);
                i++;
        }

        if (i == timeout) {
                hw_dbg(hw, "Driver can't access device - SMBI bit is set.\n");
                return -E1000_ERR_NVM;
        }

        /* Get the FW semaphore. */
        for (i = 0; i < timeout; i++) {
                swsm = er32(SWSM);
                ew32(SWSM, swsm | E1000_SWSM_SWESMBI);

                /* Semaphore acquired if bit latched */
                if (er32(SWSM) & E1000_SWSM_SWESMBI)
                        break;

                udelay(50);
        }

        if (i == timeout) {
                /* Release semaphores */
                e1000e_put_hw_semaphore(hw);
                hw_dbg(hw, "Driver can't access the NVM\n");
                return -E1000_ERR_NVM;
        }

        return 0;
}

/**
 *  e1000e_put_hw_semaphore - Release hardware semaphore
 *  @hw: pointer to the HW structure
 *
 *  Release hardware semaphore used to access the PHY or NVM
 **/
void e1000e_put_hw_semaphore(struct e1000_hw *hw)
{
        u32 swsm;

        swsm = er32(SWSM);
        swsm &= ~(E1000_SWSM_SMBI | E1000_SWSM_SWESMBI);
        ew32(SWSM, swsm);
}

/**
 *  e1000e_get_auto_rd_done - Check for auto read completion
 *  @hw: pointer to the HW structure
 *
 *  Check EEPROM for Auto Read done bit.
 **/
s32 e1000e_get_auto_rd_done(struct e1000_hw *hw)
{
        s32 i = 0;

        while (i < AUTO_READ_DONE_TIMEOUT) {
                if (er32(EECD) & E1000_EECD_AUTO_RD)
                        break;
                msleep(1);
                i++;
        }

        if (i == AUTO_READ_DONE_TIMEOUT) {
                hw_dbg(hw, "Auto read by HW from NVM has not completed.\n");
                return -E1000_ERR_RESET;
        }

        return 0;
}

/**
 *  e1000e_valid_led_default - Verify a valid default LED config
 *  @hw: pointer to the HW structure
 *  @data: pointer to the NVM (EEPROM)
 *
 *  Read the EEPROM for the current default LED configuration.  If the
 *  LED configuration is not valid, set to a valid LED configuration.
 **/
s32 e1000e_valid_led_default(struct e1000_hw *hw, u16 *data)
{
        s32 ret_val;

        ret_val = e1000_read_nvm(hw, NVM_ID_LED_SETTINGS, 1, data);
        if (ret_val) {
                hw_dbg(hw, "NVM Read Error\n");
                return ret_val;
        }

        if (*data == ID_LED_RESERVED_0000 || *data == ID_LED_RESERVED_FFFF)
                *data = ID_LED_DEFAULT;

        return 0;
}

/**
 *  e1000e_id_led_init -
 *  @hw: pointer to the HW structure
 *
 **/
s32 e1000e_id_led_init(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        s32 ret_val;
        const u32 ledctl_mask = 0x000000FF;
        const u32 ledctl_on = E1000_LEDCTL_MODE_LED_ON;
        const u32 ledctl_off = E1000_LEDCTL_MODE_LED_OFF;
        u16 data, i, temp;
        const u16 led_mask = 0x0F;

        ret_val = hw->nvm.ops.valid_led_default(hw, &data);
        if (ret_val)
                return ret_val;

        mac->ledctl_default = er32(LEDCTL);
        mac->ledctl_mode1 = mac->ledctl_default;
        mac->ledctl_mode2 = mac->ledctl_default;

        for (i = 0; i < 4; i++) {
                temp = (data >> (i << 2)) & led_mask;
                switch (temp) {
                case ID_LED_ON1_DEF2:
                case ID_LED_ON1_ON2:
                case ID_LED_ON1_OFF2:
                        mac->ledctl_mode1 &= ~(ledctl_mask << (i << 3));
                        mac->ledctl_mode1 |= ledctl_on << (i << 3);
                        break;
                case ID_LED_OFF1_DEF2:
                case ID_LED_OFF1_ON2:
                case ID_LED_OFF1_OFF2:
                        mac->ledctl_mode1 &= ~(ledctl_mask << (i << 3));
                        mac->ledctl_mode1 |= ledctl_off << (i << 3);
                        break;
                default:
                        /* Do nothing */
                        break;
                }
                switch (temp) {
                case ID_LED_DEF1_ON2:
                case ID_LED_ON1_ON2:
                case ID_LED_OFF1_ON2:
                        mac->ledctl_mode2 &= ~(ledctl_mask << (i << 3));
                        mac->ledctl_mode2 |= ledctl_on << (i << 3);
                        break;
                case ID_LED_DEF1_OFF2:
                case ID_LED_ON1_OFF2:
                case ID_LED_OFF1_OFF2:
                        mac->ledctl_mode2 &= ~(ledctl_mask << (i << 3));
                        mac->ledctl_mode2 |= ledctl_off << (i << 3);
                        break;
                default:
                        /* Do nothing */
                        break;
                }
        }

        return 0;
}

/**
 *  e1000e_cleanup_led_generic - Set LED config to default operation
 *  @hw: pointer to the HW structure
 *
 *  Remove the current LED configuration and set the LED configuration
 *  to the default value, saved from the EEPROM.
 **/
s32 e1000e_cleanup_led_generic(struct e1000_hw *hw)
{
        ew32(LEDCTL, hw->mac.ledctl_default);
        return 0;
}

/**
 *  e1000e_blink_led - Blink LED
 *  @hw: pointer to the HW structure
 *
 *  Blink the LEDs which are set to be on.
 **/
s32 e1000e_blink_led(struct e1000_hw *hw)
{
        u32 ledctl_blink = 0;
        u32 i;

        if (hw->media_type == e1000_media_type_fiber) {
                /* always blink LED0 for PCI-E fiber */
                ledctl_blink = E1000_LEDCTL_LED0_BLINK |
                     (E1000_LEDCTL_MODE_LED_ON << E1000_LEDCTL_LED0_MODE_SHIFT);
        } else {
                /*
                 * set the blink bit for each LED that's "on" (0x0E)
                 * in ledctl_mode2
                 */
                ledctl_blink = hw->mac.ledctl_mode2;
                for (i = 0; i < 4; i++)
                        if (((hw->mac.ledctl_mode2 >> (i * 8)) & 0xFF) ==
                            E1000_LEDCTL_MODE_LED_ON)
                                ledctl_blink |= (E1000_LEDCTL_LED0_BLINK <<
                                                 (i * 8));
        }

        ew32(LEDCTL, ledctl_blink);

        return 0;
}

/**
 *  e1000e_led_on_generic - Turn LED on
 *  @hw: pointer to the HW structure
 *
 *  Turn LED on.
 **/
s32 e1000e_led_on_generic(struct e1000_hw *hw)
{
        u32 ctrl;

        switch (hw->media_type) {
        case e1000_media_type_fiber:
                ctrl = er32(CTRL);
                ctrl &= ~E1000_CTRL_SWDPIN0;
                ctrl |= E1000_CTRL_SWDPIO0;
                ew32(CTRL, ctrl);
                break;
        case e1000_media_type_copper:
                ew32(LEDCTL, hw->mac.ledctl_mode2);
                break;
        default:
                break;
        }

        return 0;
}

/**
 *  e1000e_led_off_generic - Turn LED off
 *  @hw: pointer to the HW structure
 *
 *  Turn LED off.
 **/
s32 e1000e_led_off_generic(struct e1000_hw *hw)
{
        u32 ctrl;

        switch (hw->media_type) {
        case e1000_media_type_fiber:
                ctrl = er32(CTRL);
                ctrl |= E1000_CTRL_SWDPIN0;
                ctrl |= E1000_CTRL_SWDPIO0;
                ew32(CTRL, ctrl);
                break;
        case e1000_media_type_copper:
                ew32(LEDCTL, hw->mac.ledctl_mode1);
                break;
        default:
                break;
        }

        return 0;
}

/**
 *  e1000e_set_pcie_no_snoop - Set PCI-express capabilities
 *  @hw: pointer to the HW structure
 *  @no_snoop: bitmap of snoop events
 *
 *  Set the PCI-express register to snoop for events enabled in 'no_snoop'.
 **/
void e1000e_set_pcie_no_snoop(struct e1000_hw *hw, u32 no_snoop)
{
        u32 gcr;

        if (no_snoop) {
                gcr = er32(GCR);
                gcr &= ~(PCIE_NO_SNOOP_ALL);
                gcr |= no_snoop;
                ew32(GCR, gcr);
        }
}

/**
 *  e1000e_disable_pcie_master - Disables PCI-express master access
 *  @hw: pointer to the HW structure
 *
 *  Returns 0 if successful, else returns -10
 *  (-E1000_ERR_MASTER_REQUESTS_PENDING) if master disable bit has not caused
 *  the master requests to be disabled.
 *
 *  Disables PCI-Express master access and verifies there are no pending
 *  requests.
 **/
s32 e1000e_disable_pcie_master(struct e1000_hw *hw)
{
        u32 ctrl;
        s32 timeout = MASTER_DISABLE_TIMEOUT;

        ctrl = er32(CTRL);
        ctrl |= E1000_CTRL_GIO_MASTER_DISABLE;
        ew32(CTRL, ctrl);

        while (timeout) {
                if (!(er32(STATUS) &
                      E1000_STATUS_GIO_MASTER_ENABLE))
                        break;
                udelay(100);
                timeout--;
        }

        if (!timeout) {
                hw_dbg(hw, "Master requests are pending.\n");
                return -E1000_ERR_MASTER_REQUESTS_PENDING;
        }

        return 0;
}

/**
 *  e1000e_reset_adaptive - Reset Adaptive Interframe Spacing
 *  @hw: pointer to the HW structure
 *
 *  Reset the Adaptive Interframe Spacing throttle to default values.
 **/
void e1000e_reset_adaptive(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;

        mac->current_ifs_val = 0;
        mac->ifs_min_val = IFS_MIN;
        mac->ifs_max_val = IFS_MAX;
        mac->ifs_step_size = IFS_STEP;
        mac->ifs_ratio = IFS_RATIO;

        mac->in_ifs_mode = 0;
        ew32(AIT, 0);
}

/**
 *  e1000e_update_adaptive - Update Adaptive Interframe Spacing
 *  @hw: pointer to the HW structure
 *
 *  Update the Adaptive Interframe Spacing Throttle value based on the
 *  time between transmitted packets and time between collisions.
 **/
void e1000e_update_adaptive(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;

        if ((mac->collision_delta * mac->ifs_ratio) > mac->tx_packet_delta) {
                if (mac->tx_packet_delta > MIN_NUM_XMITS) {
                        mac->in_ifs_mode = 1;
                        if (mac->current_ifs_val < mac->ifs_max_val) {
                                if (!mac->current_ifs_val)
                                        mac->current_ifs_val = mac->ifs_min_val;
                                else
                                        mac->current_ifs_val +=
                                                mac->ifs_step_size;
                                ew32(AIT, mac->current_ifs_val);
                        }
                }
        } else {
                if (mac->in_ifs_mode &&
                    (mac->tx_packet_delta <= MIN_NUM_XMITS)) {
                        mac->current_ifs_val = 0;
                        mac->in_ifs_mode = 0;
                        ew32(AIT, 0);
                }
        }
}

/**
 *  e1000_raise_eec_clk - Raise EEPROM clock
 *  @hw: pointer to the HW structure
 *  @eecd: pointer to the EEPROM
 *
 *  Enable/Raise the EEPROM clock bit.
 **/
static void e1000_raise_eec_clk(struct e1000_hw *hw, u32 *eecd)
{
        *eecd = *eecd | E1000_EECD_SK;
        ew32(EECD, *eecd);
        e1e_flush();
        udelay(hw->nvm.delay_usec);
}

/**
 *  e1000_lower_eec_clk - Lower EEPROM clock
 *  @hw: pointer to the HW structure
 *  @eecd: pointer to the EEPROM
 *
 *  Clear/Lower the EEPROM clock bit.
 **/
static void e1000_lower_eec_clk(struct e1000_hw *hw, u32 *eecd)
{
        *eecd = *eecd & ~E1000_EECD_SK;
        ew32(EECD, *eecd);
        e1e_flush();
        udelay(hw->nvm.delay_usec);
}

/**
 *  e1000_shift_out_eec_bits - Shift data bits our to the EEPROM
 *  @hw: pointer to the HW structure
 *  @data: data to send to the EEPROM
 *  @count: number of bits to shift out
 *
 *  We need to shift 'count' bits out to the EEPROM.  So, the value in the
 *  "data" parameter will be shifted out to the EEPROM one bit at a time.
 *  In order to do this, "data" must be broken down into bits.
 **/
static void e1000_shift_out_eec_bits(struct e1000_hw *hw, u16 data, u16 count)
{
        struct e1000_nvm_info *nvm = &hw->nvm;
        u32 eecd = er32(EECD);
        u32 mask;

        mask = 0x01 << (count - 1);
        if (nvm->type == e1000_nvm_eeprom_spi)
                eecd |= E1000_EECD_DO;

        do {
                eecd &= ~E1000_EECD_DI;

                if (data & mask)
                        eecd |= E1000_EECD_DI;

                ew32(EECD, eecd);
                e1e_flush();

                udelay(nvm->delay_usec);

                e1000_raise_eec_clk(hw, &eecd);
                e1000_lower_eec_clk(hw, &eecd);

                mask >>= 1;
        } while (mask);

        eecd &= ~E1000_EECD_DI;
        ew32(EECD, eecd);
}

/**
 *  e1000_shift_in_eec_bits - Shift data bits in from the EEPROM
 *  @hw: pointer to the HW structure
 *  @count: number of bits to shift in
 *
 *  In order to read a register from the EEPROM, we need to shift 'count' bits
 *  in from the EEPROM.  Bits are "shifted in" by raising the clock input to
 *  the EEPROM (setting the SK bit), and then reading the value of the data out
 *  "DO" bit.  During this "shifting in" process the data in "DI" bit should
 *  always be clear.
 **/
static u16 e1000_shift_in_eec_bits(struct e1000_hw *hw, u16 count)
{
        u32 eecd;
        u32 i;
        u16 data;

        eecd = er32(EECD);

        eecd &= ~(E1000_EECD_DO | E1000_EECD_DI);
        data = 0;

        for (i = 0; i < count; i++) {
                data <<= 1;
                e1000_raise_eec_clk(hw, &eecd);

                eecd = er32(EECD);

                eecd &= ~E1000_EECD_DI;
                if (eecd & E1000_EECD_DO)
                        data |= 1;

                e1000_lower_eec_clk(hw, &eecd);
        }

        return data;
}

/**
 *  e1000e_poll_eerd_eewr_done - Poll for EEPROM read/write completion
 *  @hw: pointer to the HW structure
 *  @ee_reg: EEPROM flag for polling
 *
 *  Polls the EEPROM status bit for either read or write completion based
 *  upon the value of 'ee_reg'.
 **/
s32 e1000e_poll_eerd_eewr_done(struct e1000_hw *hw, int ee_reg)
{
        u32 attempts = 100000;
        u32 i, reg = 0;

        for (i = 0; i < attempts; i++) {
                if (ee_reg == E1000_NVM_POLL_READ)
                        reg = er32(EERD);
                else
                        reg = er32(EEWR);

                if (reg & E1000_NVM_RW_REG_DONE)
                        return 0;

                udelay(5);
        }

        return -E1000_ERR_NVM;
}

/**
 *  e1000e_acquire_nvm - Generic request for access to EEPROM
 *  @hw: pointer to the HW structure
 *
 *  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).
 **/
s32 e1000e_acquire_nvm(struct e1000_hw *hw)
{
        u32 eecd = er32(EECD);
        s32 timeout = E1000_NVM_GRANT_ATTEMPTS;

        ew32(EECD, eecd | E1000_EECD_REQ);
        eecd = er32(EECD);

        while (timeout) {
                if (eecd & E1000_EECD_GNT)
                        break;
                udelay(5);
                eecd = er32(EECD);
                timeout--;
        }

        if (!timeout) {
                eecd &= ~E1000_EECD_REQ;
                ew32(EECD, eecd);
                hw_dbg(hw, "Could not acquire NVM grant\n");
                return -E1000_ERR_NVM;
        }

        return 0;
}

/**
 *  e1000_standby_nvm - Return EEPROM to standby state
 *  @hw: pointer to the HW structure
 *
 *  Return the EEPROM to a standby state.
 **/
static void e1000_standby_nvm(struct e1000_hw *hw)
{
        struct e1000_nvm_info *nvm = &hw->nvm;
        u32 eecd = er32(EECD);

        if (nvm->type == e1000_nvm_eeprom_spi) {
                /* Toggle CS to flush commands */
                eecd |= E1000_EECD_CS;
                ew32(EECD, eecd);
                e1e_flush();
                udelay(nvm->delay_usec);
                eecd &= ~E1000_EECD_CS;
                ew32(EECD, eecd);
                e1e_flush();
                udelay(nvm->delay_usec);
        }
}

/**
 *  e1000_stop_nvm - Terminate EEPROM command
 *  @hw: pointer to the HW structure
 *
 *  Terminates the current command by inverting the EEPROM's chip select pin.
 **/
static void e1000_stop_nvm(struct e1000_hw *hw)
{
        u32 eecd;

        eecd = er32(EECD);
        if (hw->nvm.type == e1000_nvm_eeprom_spi) {
                /* Pull CS high */
                eecd |= E1000_EECD_CS;
                e1000_lower_eec_clk(hw, &eecd);
        }
}

/**
 *  e1000e_release_nvm - Release exclusive access to EEPROM
 *  @hw: pointer to the HW structure
 *
 *  Stop any current commands to the EEPROM and clear the EEPROM request bit.
 **/
void e1000e_release_nvm(struct e1000_hw *hw)
{
        u32 eecd;

        e1000_stop_nvm(hw);

        eecd = er32(EECD);
        eecd &= ~E1000_EECD_REQ;
        ew32(EECD, eecd);
}

/**
 *  e1000_ready_nvm_eeprom - Prepares EEPROM for read/write
 *  @hw: pointer to the HW structure
 *
 *  Setups the EEPROM for reading and writing.
 **/
static s32 e1000_ready_nvm_eeprom(struct e1000_hw *hw)
{
        struct e1000_nvm_info *nvm = &hw->nvm;
        u32 eecd = er32(EECD);
        u16 timeout = 0;
        u8 spi_stat_reg;

        if (nvm->type == e1000_nvm_eeprom_spi) {
                /* Clear SK and CS */
                eecd &= ~(E1000_EECD_CS | E1000_EECD_SK);
                ew32(EECD, eecd);
                udelay(1);
                timeout = NVM_MAX_RETRY_SPI;

                /*
                 * Read "Status Register" repeatedly until the LSB is cleared.
                 * The EEPROM will signal that the command has been completed
                 * by clearing bit 0 of the internal status register.  If it's
                 * not cleared within 'timeout', then error out.
                 */
                while (timeout) {
                        e1000_shift_out_eec_bits(hw, NVM_RDSR_OPCODE_SPI,
                                                 hw->nvm.opcode_bits);
                        spi_stat_reg = (u8)e1000_shift_in_eec_bits(hw, 8);
                        if (!(spi_stat_reg & NVM_STATUS_RDY_SPI))
                                break;

                        udelay(5);
                        e1000_standby_nvm(hw);
                        timeout--;
                }

                if (!timeout) {
                        hw_dbg(hw, "SPI NVM Status error\n");
                        return -E1000_ERR_NVM;
                }
        }

        return 0;
}

/**
 *  e1000e_read_nvm_eerd - Reads EEPROM using EERD register
 *  @hw: pointer to the HW structure
 *  @offset: offset of word in the EEPROM to read
 *  @words: number of words to read
 *  @data: word read from the EEPROM
 *
 *  Reads a 16 bit word from the EEPROM using the EERD register.
 **/
s32 e1000e_read_nvm_eerd(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
{
        struct e1000_nvm_info *nvm = &hw->nvm;
        u32 i, eerd = 0;
        s32 ret_val = 0;

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

        for (i = 0; i < words; i++) {
                eerd = ((offset+i) << E1000_NVM_RW_ADDR_SHIFT) +
                       E1000_NVM_RW_REG_START;

                ew32(EERD, eerd);
                ret_val = e1000e_poll_eerd_eewr_done(hw, E1000_NVM_POLL_READ);
                if (ret_val)
                        break;

                data[i] = (er32(EERD) >> E1000_NVM_RW_REG_DATA);
        }

        return ret_val;
}

/**
 *  e1000e_write_nvm_spi - Write to EEPROM using SPI
 *  @hw: pointer to the HW structure
 *  @offset: offset within the EEPROM to be written to
 *  @words: number of words to write
 *  @data: 16 bit word(s) to be written to the EEPROM
 *
 *  Writes data to EEPROM at offset using SPI interface.
 *
 *  If e1000e_update_nvm_checksum is not called after this function , the
 *  EEPROM will most likely contain an invalid checksum.
 **/
s32 e1000e_write_nvm_spi(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
{
        struct e1000_nvm_info *nvm = &hw->nvm;
        s32 ret_val;
        u16 widx = 0;

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

        ret_val = nvm->ops.acquire_nvm(hw);
        if (ret_val)
                return ret_val;

        msleep(10);

        while (widx < words) {
                u8 write_opcode = NVM_WRITE_OPCODE_SPI;

                ret_val = e1000_ready_nvm_eeprom(hw);
                if (ret_val) {
                        nvm->ops.release_nvm(hw);
                        return ret_val;
                }

                e1000_standby_nvm(hw);

                /* Send the WRITE ENABLE command (8 bit opcode) */
                e1000_shift_out_eec_bits(hw, NVM_WREN_OPCODE_SPI,
                                         nvm->opcode_bits);

                e1000_standby_nvm(hw);

                /*
                 * Some SPI eeproms use the 8th address bit embedded in the
                 * opcode
                 */
                if ((nvm->address_bits == 8) && (offset >= 128))
                        write_opcode |= NVM_A8_OPCODE_SPI;

                /* Send the Write command (8-bit opcode + addr) */
                e1000_shift_out_eec_bits(hw, write_opcode, nvm->opcode_bits);
                e1000_shift_out_eec_bits(hw, (u16)((offset + widx) * 2),
                                         nvm->address_bits);

                /* Loop to allow for up to whole page write of eeprom */
                while (widx < words) {
                        u16 word_out = data[widx];
                        word_out = (word_out >> 8) | (word_out << 8);
                        e1000_shift_out_eec_bits(hw, word_out, 16);
                        widx++;

                        if ((((offset + widx) * 2) % nvm->page_size) == 0) {
                                e1000_standby_nvm(hw);
                                break;
                        }
                }
        }

        msleep(10);
        return 0;
}

/**
 *  e1000e_read_mac_addr - Read device MAC address
 *  @hw: pointer to the HW structure
 *
 *  Reads the device MAC address from the EEPROM and stores the value.
 *  Since devices with two ports use the same EEPROM, we increment the
 *  last bit in the MAC address for the second port.
 **/
s32 e1000e_read_mac_addr(struct e1000_hw *hw)
{
        s32 ret_val;
        u16 offset, nvm_data, i;
        u16 mac_addr_offset = 0;

        if (hw->mac.type == e1000_82571) {
                /* Check for an alternate MAC address.  An alternate MAC
                 * address can be setup by pre-boot software and must be
                 * treated like a permanent address and must override the
                 * actual permanent MAC address.*/
                ret_val = e1000_read_nvm(hw, NVM_ALT_MAC_ADDR_PTR, 1,
                                         &mac_addr_offset);
                if (ret_val) {
                        hw_dbg(hw, "NVM Read Error\n");
                        return ret_val;
                }
                if (mac_addr_offset == 0xFFFF)
                        mac_addr_offset = 0;

                if (mac_addr_offset) {
                        if (hw->bus.func == E1000_FUNC_1)
                                mac_addr_offset += ETH_ALEN/sizeof(u16);

                        /* make sure we have a valid mac address here
                        * before using it */
                        ret_val = e1000_read_nvm(hw, mac_addr_offset, 1,
                                                 &nvm_data);
                        if (ret_val) {
                                hw_dbg(hw, "NVM Read Error\n");
                                return ret_val;
                        }
                        if (nvm_data & 0x0001)
                                mac_addr_offset = 0;
                }

                if (mac_addr_offset)
                hw->dev_spec.e82571.alt_mac_addr_is_present = 1;
        }

        for (i = 0; i < ETH_ALEN; i += 2) {
                offset = mac_addr_offset + (i >> 1);
                ret_val = e1000_read_nvm(hw, offset, 1, &nvm_data);
                if (ret_val) {
                        hw_dbg(hw, "NVM Read Error\n");
                        return ret_val;
                }
                hw->mac.perm_addr[i] = (u8)(nvm_data & 0xFF);
                hw->mac.perm_addr[i+1] = (u8)(nvm_data >> 8);
        }

        /* Flip last bit of mac address if we're on second port */
        if (!mac_addr_offset && hw->bus.func == E1000_FUNC_1)
                hw->mac.perm_addr[5] ^= 1;

        for (i = 0; i < ETH_ALEN; i++)
                hw->mac.addr[i] = hw->mac.perm_addr[i];

        return 0;
}

/**
 *  e1000e_validate_nvm_checksum_generic - Validate EEPROM checksum
 *  @hw: pointer to the HW structure
 *
 *  Calculates the EEPROM checksum by reading/adding each word of the EEPROM
 *  and then verifies that the sum of the EEPROM is equal to 0xBABA.
 **/
s32 e1000e_validate_nvm_checksum_generic(struct e1000_hw *hw)
{
        s32 ret_val;
        u16 checksum = 0;
        u16 i, nvm_data;

        for (i = 0; i < (NVM_CHECKSUM_REG + 1); i++) {
                ret_val = e1000_read_nvm(hw, i, 1, &nvm_data);
                if (ret_val) {
                        hw_dbg(hw, "NVM Read Error\n");
                        return ret_val;
                }
                checksum += nvm_data;
        }

        if (checksum != (u16) NVM_SUM) {
                hw_dbg(hw, "NVM Checksum Invalid\n");
                return -E1000_ERR_NVM;
        }

        return 0;
}

/**
 *  e1000e_update_nvm_checksum_generic - Update EEPROM checksum
 *  @hw: pointer to the HW structure
 *
 *  Updates the EEPROM checksum by reading/adding each word of the EEPROM
 *  up to the checksum.  Then calculates the EEPROM checksum and writes the
 *  value to the EEPROM.
 **/
s32 e1000e_update_nvm_checksum_generic(struct e1000_hw *hw)
{
        s32 ret_val;
        u16 checksum = 0;
        u16 i, nvm_data;

        for (i = 0; i < NVM_CHECKSUM_REG; i++) {
                ret_val = e1000_read_nvm(hw, i, 1, &nvm_data);
                if (ret_val) {
                        hw_dbg(hw, "NVM Read Error while updating checksum.\n");
                        return ret_val;
                }
                checksum += nvm_data;
        }
        checksum = (u16) NVM_SUM - checksum;
        ret_val = e1000_write_nvm(hw, NVM_CHECKSUM_REG, 1, &checksum);
        if (ret_val)
                hw_dbg(hw, "NVM Write Error while updating checksum.\n");

        return ret_val;
}

/**
 *  e1000e_reload_nvm - Reloads EEPROM
 *  @hw: pointer to the HW structure
 *
 *  Reloads the EEPROM by setting the "Reinitialize from EEPROM" bit in the
 *  extended control register.
 **/
void e1000e_reload_nvm(struct e1000_hw *hw)
{
        u32 ctrl_ext;

        udelay(10);
        ctrl_ext = er32(CTRL_EXT);
        ctrl_ext |= E1000_CTRL_EXT_EE_RST;
        ew32(CTRL_EXT, ctrl_ext);
        e1e_flush();
}

/**
 *  e1000_calculate_checksum - Calculate checksum for buffer
 *  @buffer: pointer to EEPROM
 *  @length: size of EEPROM to calculate a checksum for
 *
 *  Calculates the checksum for some buffer on a specified length.  The
 *  checksum calculated is returned.
 **/
static u8 e1000_calculate_checksum(u8 *buffer, u32 length)
{
        u32 i;
        u8  sum = 0;

        if (!buffer)
                return 0;

        for (i = 0; i < length; i++)
                sum += buffer[i];

        return (u8) (0 - sum);
}

/**
 *  e1000_mng_enable_host_if - Checks host interface is enabled
 *  @hw: pointer to the HW structure
 *
 *  Returns E1000_success upon success, else E1000_ERR_HOST_INTERFACE_COMMAND
 *
 *  This function checks whether the HOST IF is enabled for command operation
 *  and also checks whether the previous command is completed.  It busy waits
 *  in case of previous command is not completed.
 **/
static s32 e1000_mng_enable_host_if(struct e1000_hw *hw)
{
        u32 hicr;
        u8 i;

        /* Check that the host interface is enabled. */
        hicr = er32(HICR);
        if ((hicr & E1000_HICR_EN) == 0) {
                hw_dbg(hw, "E1000_HOST_EN bit disabled.\n");
                return -E1000_ERR_HOST_INTERFACE_COMMAND;
        }
        /* check the previous command is completed */
        for (i = 0; i < E1000_MNG_DHCP_COMMAND_TIMEOUT; i++) {
                hicr = er32(HICR);
                if (!(hicr & E1000_HICR_C))
                        break;
                mdelay(1);
        }

        if (i == E1000_MNG_DHCP_COMMAND_TIMEOUT) {
                hw_dbg(hw, "Previous command timeout failed .\n");
                return -E1000_ERR_HOST_INTERFACE_COMMAND;
        }

        return 0;
}

/**
 *  e1000e_check_mng_mode - check management mode
 *  @hw: pointer to the HW structure
 *
 *  Reads the firmware semaphore register and returns true (>0) if
 *  manageability is enabled, else false (0).
 **/
bool e1000e_check_mng_mode(struct e1000_hw *hw)
{
        u32 fwsm = er32(FWSM);

        return (fwsm & E1000_FWSM_MODE_MASK) == hw->mac.ops.mng_mode_enab;
}

/**
 *  e1000e_enable_tx_pkt_filtering - Enable packet filtering on Tx
 *  @hw: pointer to the HW structure
 *
 *  Enables packet filtering on transmit packets if manageability is enabled
 *  and host interface is enabled.
 **/
bool e1000e_enable_tx_pkt_filtering(struct e1000_hw *hw)
{
        struct e1000_host_mng_dhcp_cookie *hdr = &hw->mng_cookie;
        u32 *buffer = (u32 *)&hw->mng_cookie;
        u32 offset;
        s32 ret_val, hdr_csum, csum;
        u8 i, len;

        /* No manageability, no filtering */
        if (!e1000e_check_mng_mode(hw)) {
                hw->mac.tx_pkt_filtering = 0;
                return 0;
        }

        /*
         * If we can't read from the host interface for whatever
         * reason, disable filtering.
         */
        ret_val = e1000_mng_enable_host_if(hw);
        if (ret_val != 0) {
                hw->mac.tx_pkt_filtering = 0;
                return ret_val;
        }

        /* Read in the header.  Length and offset are in dwords. */
        len    = E1000_MNG_DHCP_COOKIE_LENGTH >> 2;
        offset = E1000_MNG_DHCP_COOKIE_OFFSET >> 2;
        for (i = 0; i < len; i++)
                *(buffer + i) = E1000_READ_REG_ARRAY(hw, E1000_HOST_IF, offset + i);
        hdr_csum = hdr->checksum;
        hdr->checksum = 0;
        csum = e1000_calculate_checksum((u8 *)hdr,
                                        E1000_MNG_DHCP_COOKIE_LENGTH);
        /*
         * If either the checksums or signature don't match, then
         * the cookie area isn't considered valid, in which case we
         * take the safe route of assuming Tx filtering is enabled.
         */
        if ((hdr_csum != csum) || (hdr->signature != E1000_IAMT_SIGNATURE)) {
                hw->mac.tx_pkt_filtering = 1;
                return 1;
        }

        /* Cookie area is valid, make the final check for filtering. */
        if (!(hdr->status & E1000_MNG_DHCP_COOKIE_STATUS_PARSING)) {
                hw->mac.tx_pkt_filtering = 0;
                return 0;
        }

        hw->mac.tx_pkt_filtering = 1;
        return 1;
}

/**
 *  e1000_mng_write_cmd_header - Writes manageability command header
 *  @hw: pointer to the HW structure
 *  @hdr: pointer to the host interface command header
 *
 *  Writes the command header after does the checksum calculation.
 **/
static s32 e1000_mng_write_cmd_header(struct e1000_hw *hw,
                                  struct e1000_host_mng_command_header *hdr)
{
        u16 i, length = sizeof(struct e1000_host_mng_command_header);

        /* Write the whole command header structure with new checksum. */

        hdr->checksum = e1000_calculate_checksum((u8 *)hdr, length);

        length >>= 2;
        /* Write the relevant command block into the ram area. */
        for (i = 0; i < length; i++) {
                E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, i,
                                            *((u32 *) hdr + i));
                e1e_flush();
        }

        return 0;
}

/**
 *  e1000_mng_host_if_write - Writes to the manageability host interface
 *  @hw: pointer to the HW structure
 *  @buffer: pointer to the host interface buffer
 *  @length: size of the buffer
 *  @offset: location in the buffer to write to
 *  @sum: sum of the data (not checksum)
 *
 *  This function writes the buffer content at the offset given on the host if.
 *  It also does alignment considerations to do the writes in most efficient
 *  way.  Also fills up the sum of the buffer in *buffer parameter.
 **/
static s32 e1000_mng_host_if_write(struct e1000_hw *hw, u8 *buffer,
                                   u16 length, u16 offset, u8 *sum)
{
        u8 *tmp;
        u8 *bufptr = buffer;
        u32 data = 0;
        u16 remaining, i, j, prev_bytes;

        /* sum = only sum of the data and it is not checksum */

        if (length == 0 || offset + length > E1000_HI_MAX_MNG_DATA_LENGTH)
                return -E1000_ERR_PARAM;

        tmp = (u8 *)&data;
        prev_bytes = offset & 0x3;
        offset >>= 2;

        if (prev_bytes) {
                data = E1000_READ_REG_ARRAY(hw, E1000_HOST_IF, offset);
                for (j = prev_bytes; j < sizeof(u32); j++) {
                        *(tmp + j) = *bufptr++;
                        *sum += *(tmp + j);
                }
                E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset, data);
                length -= j - prev_bytes;
                offset++;
        }

        remaining = length & 0x3;
        length -= remaining;

        /* Calculate length in DWORDs */
        length >>= 2;

        /*
         * The device driver writes the relevant command block into the
         * ram area.
         */
        for (i = 0; i < length; i++) {
                for (j = 0; j < sizeof(u32); j++) {
                        *(tmp + j) = *bufptr++;
                        *sum += *(tmp + j);
                }

                E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset + i, data);
        }
        if (remaining) {
                for (j = 0; j < sizeof(u32); j++) {
                        if (j < remaining)
                                *(tmp + j) = *bufptr++;
                        else
                                *(tmp + j) = 0;

                        *sum += *(tmp + j);
                }
                E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset + i, data);
        }

        return 0;
}

/**
 *  e1000e_mng_write_dhcp_info - Writes DHCP info to host interface
 *  @hw: pointer to the HW structure
 *  @buffer: pointer to the host interface
 *  @length: size of the buffer
 *
 *  Writes the DHCP information to the host interface.
 **/
s32 e1000e_mng_write_dhcp_info(struct e1000_hw *hw, u8 *buffer, u16 length)
{
        struct e1000_host_mng_command_header hdr;
        s32 ret_val;
        u32 hicr;

        hdr.command_id = E1000_MNG_DHCP_TX_PAYLOAD_CMD;
        hdr.command_length = length;
        hdr.reserved1 = 0;
        hdr.reserved2 = 0;
        hdr.checksum = 0;

        /* Enable the host interface */
        ret_val = e1000_mng_enable_host_if(hw);
        if (ret_val)
                return ret_val;

        /* Populate the host interface with the contents of "buffer". */
        ret_val = e1000_mng_host_if_write(hw, buffer, length,
                                          sizeof(hdr), &(hdr.checksum));
        if (ret_val)
                return ret_val;

        /* Write the manageability command header */
        ret_val = e1000_mng_write_cmd_header(hw, &hdr);
        if (ret_val)
                return ret_val;

        /* Tell the ARC a new command is pending. */
        hicr = er32(HICR);
        ew32(HICR, hicr | E1000_HICR_C);

        return 0;
}

/**
 *  e1000e_enable_mng_pass_thru - Enable processing of ARP's
 *  @hw: pointer to the HW structure
 *
 *  Verifies the hardware needs to allow ARPs to be processed by the host.
 **/
bool e1000e_enable_mng_pass_thru(struct e1000_hw *hw)
{
        u32 manc;
        u32 fwsm, factps;
        bool ret_val = 0;

        manc = er32(MANC);

        if (!(manc & E1000_MANC_RCV_TCO_EN) ||
            !(manc & E1000_MANC_EN_MAC_ADDR_FILTER))
                return ret_val;

        if (hw->mac.arc_subsystem_valid) {
                fwsm = er32(FWSM);
                factps = er32(FACTPS);

                if (!(factps & E1000_FACTPS_MNGCG) &&
                    ((fwsm & E1000_FWSM_MODE_MASK) ==
                     (e1000_mng_mode_pt << E1000_FWSM_MODE_SHIFT))) {
                        ret_val = 1;
                        return ret_val;
                }
        } else {
                if ((manc & E1000_MANC_SMBUS_EN) &&
                    !(manc & E1000_MANC_ASF_EN)) {
                        ret_val = 1;
                        return ret_val;
                }
        }

        return ret_val;
}

s32 e1000e_read_part_num(struct e1000_hw *hw, u32 *part_num)
{
        s32 ret_val;
        u16 nvm_data;

        ret_val = e1000_read_nvm(hw, NVM_PBA_OFFSET_0, 1, &nvm_data);
        if (ret_val) {
                hw_dbg(hw, "NVM Read Error\n");
                return ret_val;
        }
        *part_num = (u32)(nvm_data << 16);

        ret_val = e1000_read_nvm(hw, NVM_PBA_OFFSET_1, 1, &nvm_data);
        if (ret_val) {
                hw_dbg(hw, "NVM Read Error\n");
                return ret_val;
        }
        *part_num |= nvm_data;

        return 0;
}