FreeBSD/Linux Kernel Cross Reference
sys/dev/e1000/e1000_82543.c

     /******************************************************************************
       SPDX-License-Identifier: BSD-3-Clause
     
       Copyright (c) 2001-2020, Intel Corporation
       All rights reserved.
     
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    /*$FreeBSD$*/
    
    /*
     * 82543GC Gigabit Ethernet Controller (Fiber)
     * 82543GC Gigabit Ethernet Controller (Copper)
     * 82544EI Gigabit Ethernet Controller (Copper)
     * 82544EI Gigabit Ethernet Controller (Fiber)
     * 82544GC Gigabit Ethernet Controller (Copper)
     * 82544GC Gigabit Ethernet Controller (LOM)
     */
    
    #include "e1000_api.h"
    
    static s32  e1000_init_phy_params_82543(struct e1000_hw *hw);
    static s32  e1000_init_nvm_params_82543(struct e1000_hw *hw);
    static s32  e1000_init_mac_params_82543(struct e1000_hw *hw);
    static s32  e1000_read_phy_reg_82543(struct e1000_hw *hw, u32 offset,
                                         u16 *data);
    static s32  e1000_write_phy_reg_82543(struct e1000_hw *hw, u32 offset,
                                          u16 data);
    static s32  e1000_phy_force_speed_duplex_82543(struct e1000_hw *hw);
    static s32  e1000_phy_hw_reset_82543(struct e1000_hw *hw);
    static s32  e1000_reset_hw_82543(struct e1000_hw *hw);
    static s32  e1000_init_hw_82543(struct e1000_hw *hw);
    static s32  e1000_setup_link_82543(struct e1000_hw *hw);
    static s32  e1000_setup_copper_link_82543(struct e1000_hw *hw);
    static s32  e1000_setup_fiber_link_82543(struct e1000_hw *hw);
    static s32  e1000_check_for_copper_link_82543(struct e1000_hw *hw);
    static s32  e1000_check_for_fiber_link_82543(struct e1000_hw *hw);
    static s32  e1000_led_on_82543(struct e1000_hw *hw);
    static s32  e1000_led_off_82543(struct e1000_hw *hw);
    static void e1000_write_vfta_82543(struct e1000_hw *hw, u32 offset,
                                       u32 value);
    static void e1000_clear_hw_cntrs_82543(struct e1000_hw *hw);
    static s32  e1000_config_mac_to_phy_82543(struct e1000_hw *hw);
    static bool e1000_init_phy_disabled_82543(struct e1000_hw *hw);
    static void e1000_lower_mdi_clk_82543(struct e1000_hw *hw, u32 *ctrl);
    static s32  e1000_polarity_reversal_workaround_82543(struct e1000_hw *hw);
    static void e1000_raise_mdi_clk_82543(struct e1000_hw *hw, u32 *ctrl);
    static u16  e1000_shift_in_mdi_bits_82543(struct e1000_hw *hw);
    static void e1000_shift_out_mdi_bits_82543(struct e1000_hw *hw, u32 data,
                                               u16 count);
    static bool e1000_tbi_compatibility_enabled_82543(struct e1000_hw *hw);
    static void e1000_set_tbi_sbp_82543(struct e1000_hw *hw, bool state);
    static s32  e1000_read_mac_addr_82543(struct e1000_hw *hw);
    
    
    /**
     *  e1000_init_phy_params_82543 - Init PHY func ptrs.
     *  @hw: pointer to the HW structure
     **/
    static s32 e1000_init_phy_params_82543(struct e1000_hw *hw)
    {
            struct e1000_phy_info *phy = &hw->phy;
            s32 ret_val = E1000_SUCCESS;
    
            DEBUGFUNC("e1000_init_phy_params_82543");
    
            if (hw->phy.media_type != e1000_media_type_copper) {
                    phy->type = e1000_phy_none;
                    goto out;
            } else {
                    phy->ops.power_up = e1000_power_up_phy_copper;
                    phy->ops.power_down = e1000_power_down_phy_copper;
            }
    
           phy->addr               = 1;
           phy->autoneg_mask       = AUTONEG_ADVERTISE_SPEED_DEFAULT;
           phy->reset_delay_us     = 10000;
           phy->type               = e1000_phy_m88;
   
           /* Function Pointers */
           phy->ops.check_polarity = e1000_check_polarity_m88;
           phy->ops.commit         = e1000_phy_sw_reset_generic;
           phy->ops.force_speed_duplex = e1000_phy_force_speed_duplex_82543;
           phy->ops.get_cable_length = e1000_get_cable_length_m88;
           phy->ops.get_cfg_done   = e1000_get_cfg_done_generic;
           phy->ops.read_reg       = (hw->mac.type == e1000_82543)
                                     ? e1000_read_phy_reg_82543
                                     : e1000_read_phy_reg_m88;
           phy->ops.reset          = (hw->mac.type == e1000_82543)
                                     ? e1000_phy_hw_reset_82543
                                     : e1000_phy_hw_reset_generic;
           phy->ops.write_reg      = (hw->mac.type == e1000_82543)
                                     ? e1000_write_phy_reg_82543
                                     : e1000_write_phy_reg_m88;
           phy->ops.get_info       = e1000_get_phy_info_m88;
   
           /*
            * The external PHY of the 82543 can be in a funky state.
            * Resetting helps us read the PHY registers for acquiring
            * the PHY ID.
            */
           if (!e1000_init_phy_disabled_82543(hw)) {
                   ret_val = phy->ops.reset(hw);
                   if (ret_val) {
                           DEBUGOUT("Resetting PHY during init failed.\n");
                           goto out;
                   }
                   msec_delay(20);
           }
   
           ret_val = e1000_get_phy_id(hw);
           if (ret_val)
                   goto out;
   
           /* Verify phy id */
           switch (hw->mac.type) {
           case e1000_82543:
                   if (phy->id != M88E1000_E_PHY_ID) {
                           ret_val = -E1000_ERR_PHY;
                           goto out;
                   }
                   break;
           case e1000_82544:
                   if (phy->id != M88E1000_I_PHY_ID) {
                           ret_val = -E1000_ERR_PHY;
                           goto out;
                   }
                   break;
           default:
                   ret_val = -E1000_ERR_PHY;
                   goto out;
                   break;
           }
   
   out:
           return ret_val;
   }
   
   /**
    *  e1000_init_nvm_params_82543 - Init NVM func ptrs.
    *  @hw: pointer to the HW structure
    **/
   static s32 e1000_init_nvm_params_82543(struct e1000_hw *hw)
   {
           struct e1000_nvm_info *nvm = &hw->nvm;
   
           DEBUGFUNC("e1000_init_nvm_params_82543");
   
           nvm->type               = e1000_nvm_eeprom_microwire;
           nvm->word_size          = 64;
           nvm->delay_usec         = 50;
           nvm->address_bits       =  6;
           nvm->opcode_bits        =  3;
   
           /* Function Pointers */
           nvm->ops.read           = e1000_read_nvm_microwire;
           nvm->ops.update         = e1000_update_nvm_checksum_generic;
           nvm->ops.valid_led_default = e1000_valid_led_default_generic;
           nvm->ops.validate       = e1000_validate_nvm_checksum_generic;
           nvm->ops.write          = e1000_write_nvm_microwire;
   
           return E1000_SUCCESS;
   }
   
   /**
    *  e1000_init_mac_params_82543 - Init MAC func ptrs.
    *  @hw: pointer to the HW structure
    **/
   static s32 e1000_init_mac_params_82543(struct e1000_hw *hw)
   {
           struct e1000_mac_info *mac = &hw->mac;
   
           DEBUGFUNC("e1000_init_mac_params_82543");
   
           /* Set media type */
           switch (hw->device_id) {
           case E1000_DEV_ID_82543GC_FIBER:
           case E1000_DEV_ID_82544EI_FIBER:
                   hw->phy.media_type = e1000_media_type_fiber;
                   break;
           default:
                   hw->phy.media_type = e1000_media_type_copper;
                   break;
           }
   
           /* Set mta register count */
           mac->mta_reg_count = 128;
           /* Set rar entry count */
           mac->rar_entry_count = E1000_RAR_ENTRIES;
   
           /* Function pointers */
   
           /* bus type/speed/width */
           mac->ops.get_bus_info = e1000_get_bus_info_pci_generic;
           /* function id */
           mac->ops.set_lan_id = e1000_set_lan_id_multi_port_pci;
           /* reset */
           mac->ops.reset_hw = e1000_reset_hw_82543;
           /* hw initialization */
           mac->ops.init_hw = e1000_init_hw_82543;
           /* link setup */
           mac->ops.setup_link = e1000_setup_link_82543;
           /* physical interface setup */
           mac->ops.setup_physical_interface =
                   (hw->phy.media_type == e1000_media_type_copper)
                    ? e1000_setup_copper_link_82543 : e1000_setup_fiber_link_82543;
           /* check for link */
           mac->ops.check_for_link =
                   (hw->phy.media_type == e1000_media_type_copper)
                    ? e1000_check_for_copper_link_82543
                    : e1000_check_for_fiber_link_82543;
           /* link info */
           mac->ops.get_link_up_info =
                   (hw->phy.media_type == e1000_media_type_copper)
                    ? e1000_get_speed_and_duplex_copper_generic
                    : e1000_get_speed_and_duplex_fiber_serdes_generic;
           /* multicast address update */
           mac->ops.update_mc_addr_list = e1000_update_mc_addr_list_generic;
           /* writing VFTA */
           mac->ops.write_vfta = e1000_write_vfta_82543;
           /* clearing VFTA */
           mac->ops.clear_vfta = e1000_clear_vfta_generic;
           /* read mac address */
           mac->ops.read_mac_addr = e1000_read_mac_addr_82543;
           /* turn on/off LED */
           mac->ops.led_on = e1000_led_on_82543;
           mac->ops.led_off = e1000_led_off_82543;
           /* clear hardware counters */
           mac->ops.clear_hw_cntrs = e1000_clear_hw_cntrs_82543;
   
           /* Set tbi compatibility */
           if ((hw->mac.type != e1000_82543) ||
               (hw->phy.media_type == e1000_media_type_fiber))
                   e1000_set_tbi_compatibility_82543(hw, false);
   
           return E1000_SUCCESS;
   }
   
   /**
    *  e1000_init_function_pointers_82543 - Init func ptrs.
    *  @hw: pointer to the HW structure
    *
    *  Called to initialize all function pointers and parameters.
    **/
   void e1000_init_function_pointers_82543(struct e1000_hw *hw)
   {
           DEBUGFUNC("e1000_init_function_pointers_82543");
   
           hw->mac.ops.init_params = e1000_init_mac_params_82543;
           hw->nvm.ops.init_params = e1000_init_nvm_params_82543;
           hw->phy.ops.init_params = e1000_init_phy_params_82543;
   }
   
   /**
    *  e1000_tbi_compatibility_enabled_82543 - Returns TBI compat status
    *  @hw: pointer to the HW structure
    *
    *  Returns the current status of 10-bit Interface (TBI) compatibility
    *  (enabled/disabled).
    **/
   static bool e1000_tbi_compatibility_enabled_82543(struct e1000_hw *hw)
   {
           struct e1000_dev_spec_82543 *dev_spec = &hw->dev_spec._82543;
           bool state = false;
   
           DEBUGFUNC("e1000_tbi_compatibility_enabled_82543");
   
           if (hw->mac.type != e1000_82543) {
                   DEBUGOUT("TBI compatibility workaround for 82543 only.\n");
                   goto out;
           }
   
           state = !!(dev_spec->tbi_compatibility & TBI_COMPAT_ENABLED);
   
   out:
           return state;
   }
   
   /**
    *  e1000_set_tbi_compatibility_82543 - Set TBI compatibility
    *  @hw: pointer to the HW structure
    *  @state: enable/disable TBI compatibility
    *
    *  Enables or disabled 10-bit Interface (TBI) compatibility.
    **/
   void e1000_set_tbi_compatibility_82543(struct e1000_hw *hw, bool state)
   {
           struct e1000_dev_spec_82543 *dev_spec = &hw->dev_spec._82543;
   
           DEBUGFUNC("e1000_set_tbi_compatibility_82543");
   
           if (hw->mac.type != e1000_82543) {
                   DEBUGOUT("TBI compatibility workaround for 82543 only.\n");
                   goto out;
           }
   
           if (state)
                   dev_spec->tbi_compatibility |= TBI_COMPAT_ENABLED;
           else
                   dev_spec->tbi_compatibility &= ~TBI_COMPAT_ENABLED;
   
   out:
           return;
   }
   
   /**
    *  e1000_tbi_sbp_enabled_82543 - Returns TBI SBP status
    *  @hw: pointer to the HW structure
    *
    *  Returns the current status of 10-bit Interface (TBI) store bad packet (SBP)
    *  (enabled/disabled).
    **/
   bool e1000_tbi_sbp_enabled_82543(struct e1000_hw *hw)
   {
           struct e1000_dev_spec_82543 *dev_spec = &hw->dev_spec._82543;
           bool state = false;
   
           DEBUGFUNC("e1000_tbi_sbp_enabled_82543");
   
           if (hw->mac.type != e1000_82543) {
                   DEBUGOUT("TBI compatibility workaround for 82543 only.\n");
                   goto out;
           }
   
           state = !!(dev_spec->tbi_compatibility & TBI_SBP_ENABLED);
   
   out:
           return state;
   }
   
   /**
    *  e1000_set_tbi_sbp_82543 - Set TBI SBP
    *  @hw: pointer to the HW structure
    *  @state: enable/disable TBI store bad packet
    *
    *  Enables or disabled 10-bit Interface (TBI) store bad packet (SBP).
    **/
   static void e1000_set_tbi_sbp_82543(struct e1000_hw *hw, bool state)
   {
           struct e1000_dev_spec_82543 *dev_spec = &hw->dev_spec._82543;
   
           DEBUGFUNC("e1000_set_tbi_sbp_82543");
   
           if (state && e1000_tbi_compatibility_enabled_82543(hw))
                   dev_spec->tbi_compatibility |= TBI_SBP_ENABLED;
           else
                   dev_spec->tbi_compatibility &= ~TBI_SBP_ENABLED;
   
           return;
   }
   
   /**
    *  e1000_init_phy_disabled_82543 - Returns init PHY status
    *  @hw: pointer to the HW structure
    *
    *  Returns the current status of whether PHY initialization is disabled.
    *  True if PHY initialization is disabled else false.
    **/
   static bool e1000_init_phy_disabled_82543(struct e1000_hw *hw)
   {
           struct e1000_dev_spec_82543 *dev_spec = &hw->dev_spec._82543;
           bool ret_val;
   
           DEBUGFUNC("e1000_init_phy_disabled_82543");
   
           if (hw->mac.type != e1000_82543) {
                   ret_val = false;
                   goto out;
           }
   
           ret_val = dev_spec->init_phy_disabled;
   
   out:
           return ret_val;
   }
   
   /**
    *  e1000_tbi_adjust_stats_82543 - Adjust stats when TBI enabled
    *  @hw: pointer to the HW structure
    *  @stats: Struct containing statistic register values
    *  @frame_len: The length of the frame in question
    *  @mac_addr: The Ethernet destination address of the frame in question
    *  @max_frame_size: The maximum frame size
    *
    *  Adjusts the statistic counters when a frame is accepted by TBI_ACCEPT
    **/
   void e1000_tbi_adjust_stats_82543(struct e1000_hw *hw,
                                     struct e1000_hw_stats *stats, u32 frame_len,
                                     u8 *mac_addr, u32 max_frame_size)
   {
           if (!(e1000_tbi_sbp_enabled_82543(hw)))
                   goto out;
   
           /* First adjust the frame length. */
           frame_len--;
           /*
            * We need to adjust the statistics counters, since the hardware
            * counters overcount this packet as a CRC error and undercount
            * the packet as a good packet
            */
           /* This packet should not be counted as a CRC error. */
           stats->crcerrs--;
           /* This packet does count as a Good Packet Received. */
           stats->gprc++;
   
           /* Adjust the Good Octets received counters */
           stats->gorc += frame_len;
   
           /*
            * Is this a broadcast or multicast?  Check broadcast first,
            * since the test for a multicast frame will test positive on
            * a broadcast frame.
            */
           if ((mac_addr[0] == 0xff) && (mac_addr[1] == 0xff))
                   /* Broadcast packet */
                   stats->bprc++;
           else if (*mac_addr & 0x01)
                   /* Multicast packet */
                   stats->mprc++;
   
           /*
            * In this case, the hardware has over counted the number of
            * oversize frames.
            */
           if ((frame_len == max_frame_size) && (stats->roc > 0))
                   stats->roc--;
   
           /*
            * Adjust the bin counters when the extra byte put the frame in the
            * wrong bin. Remember that the frame_len was adjusted above.
            */
           if (frame_len == 64) {
                   stats->prc64++;
                   stats->prc127--;
           } else if (frame_len == 127) {
                   stats->prc127++;
                   stats->prc255--;
           } else if (frame_len == 255) {
                   stats->prc255++;
                   stats->prc511--;
           } else if (frame_len == 511) {
                   stats->prc511++;
                   stats->prc1023--;
           } else if (frame_len == 1023) {
                   stats->prc1023++;
                   stats->prc1522--;
           } else if (frame_len == 1522) {
                   stats->prc1522++;
           }
   
   out:
           return;
   }
   
   /**
    *  e1000_read_phy_reg_82543 - Read PHY register
    *  @hw: pointer to the HW structure
    *  @offset: register offset to be read
    *  @data: pointer to the read data
    *
    *  Reads the PHY at offset and stores the information read to data.
    **/
   static s32 e1000_read_phy_reg_82543(struct e1000_hw *hw, u32 offset, u16 *data)
   {
           u32 mdic;
           s32 ret_val = E1000_SUCCESS;
   
           DEBUGFUNC("e1000_read_phy_reg_82543");
   
           if (offset > MAX_PHY_REG_ADDRESS) {
                   DEBUGOUT1("PHY Address %d is out of range\n", offset);
                   ret_val = -E1000_ERR_PARAM;
                   goto out;
           }
   
           /*
            * We must first send a preamble through the MDIO pin to signal the
            * beginning of an MII instruction.  This is done by sending 32
            * consecutive "1" bits.
            */
           e1000_shift_out_mdi_bits_82543(hw, PHY_PREAMBLE, PHY_PREAMBLE_SIZE);
   
           /*
            * Now combine the next few fields that are required for a read
            * operation.  We use this method instead of calling the
            * e1000_shift_out_mdi_bits routine five different times.  The format
            * of an MII read instruction consists of a shift out of 14 bits and
            * is defined as follows:
            *         <Preamble><SOF><Op Code><Phy Addr><Offset>
            * followed by a shift in of 18 bits.  This first two bits shifted in
            * are TurnAround bits used to avoid contention on the MDIO pin when a
            * READ operation is performed.  These two bits are thrown away
            * followed by a shift in of 16 bits which contains the desired data.
            */
           mdic = (offset | (hw->phy.addr << 5) |
                   (PHY_OP_READ << 10) | (PHY_SOF << 12));
   
           e1000_shift_out_mdi_bits_82543(hw, mdic, 14);
   
           /*
            * Now that we've shifted out the read command to the MII, we need to
            * "shift in" the 16-bit value (18 total bits) of the requested PHY
            * register address.
            */
           *data = e1000_shift_in_mdi_bits_82543(hw);
   
   out:
           return ret_val;
   }
   
   /**
    *  e1000_write_phy_reg_82543 - Write PHY register
    *  @hw: pointer to the HW structure
    *  @offset: register offset to be written
    *  @data: pointer to the data to be written at offset
    *
    *  Writes data to the PHY at offset.
    **/
   static s32 e1000_write_phy_reg_82543(struct e1000_hw *hw, u32 offset, u16 data)
   {
           u32 mdic;
           s32 ret_val = E1000_SUCCESS;
   
           DEBUGFUNC("e1000_write_phy_reg_82543");
   
           if (offset > MAX_PHY_REG_ADDRESS) {
                   DEBUGOUT1("PHY Address %d is out of range\n", offset);
                   ret_val = -E1000_ERR_PARAM;
                   goto out;
           }
   
           /*
            * We'll need to use the SW defined pins to shift the write command
            * out to the PHY. We first send a preamble to the PHY to signal the
            * beginning of the MII instruction.  This is done by sending 32
            * consecutive "1" bits.
            */
           e1000_shift_out_mdi_bits_82543(hw, PHY_PREAMBLE, PHY_PREAMBLE_SIZE);
   
           /*
            * Now combine the remaining required fields that will indicate a
            * write operation. We use this method instead of calling the
            * e1000_shift_out_mdi_bits routine for each field in the command. The
            * format of a MII write instruction is as follows:
            * <Preamble><SOF><Op Code><Phy Addr><Reg Addr><Turnaround><Data>.
            */
           mdic = ((PHY_TURNAROUND) | (offset << 2) | (hw->phy.addr << 7) |
                   (PHY_OP_WRITE << 12) | (PHY_SOF << 14));
           mdic <<= 16;
           mdic |= (u32)data;
   
           e1000_shift_out_mdi_bits_82543(hw, mdic, 32);
   
   out:
           return ret_val;
   }
   
   /**
    *  e1000_raise_mdi_clk_82543 - Raise Management Data Input clock
    *  @hw: pointer to the HW structure
    *  @ctrl: pointer to the control register
    *
    *  Raise the management data input clock by setting the MDC bit in the control
    *  register.
    **/
   static void e1000_raise_mdi_clk_82543(struct e1000_hw *hw, u32 *ctrl)
   {
           /*
            * Raise the clock input to the Management Data Clock (by setting the
            * MDC bit), and then delay a sufficient amount of time.
            */
           E1000_WRITE_REG(hw, E1000_CTRL, (*ctrl | E1000_CTRL_MDC));
           E1000_WRITE_FLUSH(hw);
           usec_delay(10);
   }
   
   /**
    *  e1000_lower_mdi_clk_82543 - Lower Management Data Input clock
    *  @hw: pointer to the HW structure
    *  @ctrl: pointer to the control register
    *
    *  Lower the management data input clock by clearing the MDC bit in the
    *  control register.
    **/
   static void e1000_lower_mdi_clk_82543(struct e1000_hw *hw, u32 *ctrl)
   {
           /*
            * Lower the clock input to the Management Data Clock (by clearing the
            * MDC bit), and then delay a sufficient amount of time.
            */
           E1000_WRITE_REG(hw, E1000_CTRL, (*ctrl & ~E1000_CTRL_MDC));
           E1000_WRITE_FLUSH(hw);
           usec_delay(10);
   }
   
   /**
    *  e1000_shift_out_mdi_bits_82543 - Shift data bits our to the PHY
    *  @hw: pointer to the HW structure
    *  @data: data to send to the PHY
    *  @count: number of bits to shift out
    *
    *  We need to shift 'count' bits out to the PHY.  So, the value in the
    *  "data" parameter will be shifted out to the PHY one bit at a time.
    *  In order to do this, "data" must be broken down into bits.
    **/
   static void e1000_shift_out_mdi_bits_82543(struct e1000_hw *hw, u32 data,
                                              u16 count)
   {
           u32 ctrl, mask;
   
           /*
            * We need to shift "count" number of bits out to the PHY.  So, the
            * value in the "data" parameter will be shifted out to the PHY one
            * bit at a time.  In order to do this, "data" must be broken down
            * into bits.
            */
           mask = 0x01;
           mask <<= (count - 1);
   
           ctrl = E1000_READ_REG(hw, E1000_CTRL);
   
           /* Set MDIO_DIR and MDC_DIR direction bits to be used as output pins. */
           ctrl |= (E1000_CTRL_MDIO_DIR | E1000_CTRL_MDC_DIR);
   
           while (mask) {
                   /*
                    * A "1" is shifted out to the PHY by setting the MDIO bit to
                    * "1" and then raising and lowering the Management Data Clock.
                    * A "" is shifted out to the PHY by setting the MDIO bit to
                    * "" and then raising and lowering the clock.
                    */
                   if (data & mask)
                           ctrl |= E1000_CTRL_MDIO;
                   else
                           ctrl &= ~E1000_CTRL_MDIO;
   
                   E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
                   E1000_WRITE_FLUSH(hw);
   
                   usec_delay(10);
   
                   e1000_raise_mdi_clk_82543(hw, &ctrl);
                   e1000_lower_mdi_clk_82543(hw, &ctrl);
   
                   mask >>= 1;
           }
   }
   
   /**
    *  e1000_shift_in_mdi_bits_82543 - Shift data bits in from the PHY
    *  @hw: pointer to the HW structure
    *
    *  In order to read a register from the PHY, we need to shift 18 bits
    *  in from the PHY.  Bits are "shifted in" by raising the clock input to
    *  the PHY (setting the MDC bit), and then reading the value of the data out
    *  MDIO bit.
    **/
   static u16 e1000_shift_in_mdi_bits_82543(struct e1000_hw *hw)
   {
           u32 ctrl;
           u16 data = 0;
           u8 i;
   
           /*
            * In order to read a register from the PHY, we need to shift in a
            * total of 18 bits from the PHY.  The first two bit (turnaround)
            * times are used to avoid contention on the MDIO pin when a read
            * operation is performed.  These two bits are ignored by us and
            * thrown away.  Bits are "shifted in" by raising the input to the
            * Management Data Clock (setting the MDC bit) and then reading the
            * value of the MDIO bit.
            */
           ctrl = E1000_READ_REG(hw, E1000_CTRL);
   
           /*
            * Clear MDIO_DIR (SWDPIO1) to indicate this bit is to be used as
            * input.
            */
           ctrl &= ~E1000_CTRL_MDIO_DIR;
           ctrl &= ~E1000_CTRL_MDIO;
   
           E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
           E1000_WRITE_FLUSH(hw);
   
           /*
            * Raise and lower the clock before reading in the data.  This accounts
            * for the turnaround bits.  The first clock occurred when we clocked
            * out the last bit of the Register Address.
            */
           e1000_raise_mdi_clk_82543(hw, &ctrl);
           e1000_lower_mdi_clk_82543(hw, &ctrl);
   
           for (data = 0, i = 0; i < 16; i++) {
                   data <<= 1;
                   e1000_raise_mdi_clk_82543(hw, &ctrl);
                   ctrl = E1000_READ_REG(hw, E1000_CTRL);
                   /* Check to see if we shifted in a "1". */
                   if (ctrl & E1000_CTRL_MDIO)
                           data |= 1;
                   e1000_lower_mdi_clk_82543(hw, &ctrl);
           }
   
           e1000_raise_mdi_clk_82543(hw, &ctrl);
           e1000_lower_mdi_clk_82543(hw, &ctrl);
   
           return data;
   }
   
   /**
    *  e1000_phy_force_speed_duplex_82543 - Force speed/duplex for PHY
    *  @hw: pointer to the HW structure
    *
    *  Calls the function to force speed and duplex for the m88 PHY, and
    *  if the PHY is not auto-negotiating and the speed is forced to 10Mbit,
    *  then call the function for polarity reversal workaround.
    **/
   static s32 e1000_phy_force_speed_duplex_82543(struct e1000_hw *hw)
   {
           s32 ret_val;
   
           DEBUGFUNC("e1000_phy_force_speed_duplex_82543");
   
           ret_val = e1000_phy_force_speed_duplex_m88(hw);
           if (ret_val)
                   goto out;
   
           if (!hw->mac.autoneg && (hw->mac.forced_speed_duplex &
               E1000_ALL_10_SPEED))
                   ret_val = e1000_polarity_reversal_workaround_82543(hw);
   
   out:
           return ret_val;
   }
   
   /**
    *  e1000_polarity_reversal_workaround_82543 - Workaround polarity reversal
    *  @hw: pointer to the HW structure
    *
    *  When forcing link to 10 Full or 10 Half, the PHY can reverse the polarity
    *  inadvertently.  To workaround the issue, we disable the transmitter on
    *  the PHY until we have established the link partner's link parameters.
    **/
   static s32 e1000_polarity_reversal_workaround_82543(struct e1000_hw *hw)
   {
           s32 ret_val = E1000_SUCCESS;
           u16 mii_status_reg;
           u16 i;
           bool link;
   
           if (!(hw->phy.ops.write_reg))
                   goto out;
   
           /* Polarity reversal workaround for forced 10F/10H links. */
   
           /* Disable the transmitter on the PHY */
   
           ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_PAGE_SELECT, 0x0019);
           if (ret_val)
                   goto out;
           ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_GEN_CONTROL, 0xFFFF);
           if (ret_val)
                   goto out;
   
           ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_PAGE_SELECT, 0x0000);
           if (ret_val)
                   goto out;
   
           /*
            * This loop will early-out if the NO link condition has been met.
            * In other words, DO NOT use e1000_phy_has_link_generic() here.
            */
           for (i = PHY_FORCE_TIME; i > 0; i--) {
                   /*
                    * Read the MII Status Register and wait for Link Status bit
                    * to be clear.
                    */
   
                   ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS, &mii_status_reg);
                   if (ret_val)
                           goto out;
   
                   ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS, &mii_status_reg);
                   if (ret_val)
                           goto out;
   
                   if (!(mii_status_reg & ~MII_SR_LINK_STATUS))
                           break;
                   msec_delay_irq(100);
           }
   
           /* Recommended delay time after link has been lost */
           msec_delay_irq(1000);
   
           /* Now we will re-enable the transmitter on the PHY */
   
           ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_PAGE_SELECT, 0x0019);
           if (ret_val)
                   goto out;
           msec_delay_irq(50);
           ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_GEN_CONTROL, 0xFFF0);
           if (ret_val)
                   goto out;
           msec_delay_irq(50);
           ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_GEN_CONTROL, 0xFF00);
           if (ret_val)
                   goto out;
           msec_delay_irq(50);
           ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_GEN_CONTROL, 0x0000);
           if (ret_val)
                   goto out;
   
           ret_val = hw->phy.ops.write_reg(hw, M88E1000_PHY_PAGE_SELECT, 0x0000);
           if (ret_val)
                   goto out;
   
           /*
            * Read the MII Status Register and wait for Link Status bit
            * to be set.
            */
           ret_val = e1000_phy_has_link_generic(hw, PHY_FORCE_TIME, 100000, &link);
           if (ret_val)
                   goto out;
   
   out:
           return ret_val;
   }
   
   /**
    *  e1000_phy_hw_reset_82543 - PHY hardware reset
    *  @hw: pointer to the HW structure
    *
    *  Sets the PHY_RESET_DIR bit in the extended device control register
    *  to put the PHY into a reset and waits for completion.  Once the reset
    *  has been accomplished, clear the PHY_RESET_DIR bit to take the PHY out
    *  of reset.
    **/
   static s32 e1000_phy_hw_reset_82543(struct e1000_hw *hw)
   {
           u32 ctrl_ext;
           s32 ret_val;
   
           DEBUGFUNC("e1000_phy_hw_reset_82543");
   
           /*
            * Read the Extended Device Control Register, assert the PHY_RESET_DIR
            * bit to put the PHY into reset...
            */
           ctrl_ext = E1000_READ_REG(hw, E1000_CTRL_EXT);
           ctrl_ext |= E1000_CTRL_EXT_SDP4_DIR;
           ctrl_ext &= ~E1000_CTRL_EXT_SDP4_DATA;
           E1000_WRITE_REG(hw, E1000_CTRL_EXT, ctrl_ext);
           E1000_WRITE_FLUSH(hw);
   
           msec_delay(10);
   
           /* ...then take it out of reset. */
           ctrl_ext |= E1000_CTRL_EXT_SDP4_DATA;
           E1000_WRITE_REG(hw, E1000_CTRL_EXT, ctrl_ext);
           E1000_WRITE_FLUSH(hw);
   
           usec_delay(150);
   
           if (!(hw->phy.ops.get_cfg_done))
                   return E1000_SUCCESS;
   
           ret_val = hw->phy.ops.get_cfg_done(hw);
   
           return ret_val;
   }
   
   /**
    *  e1000_reset_hw_82543 - Reset hardware
    *  @hw: pointer to the HW structure
    *
    *  This resets the hardware into a known state.
    **/
   static s32 e1000_reset_hw_82543(struct e1000_hw *hw)
   {
           u32 ctrl;
           s32 ret_val = E1000_SUCCESS;
   
           DEBUGFUNC("e1000_reset_hw_82543");
   
           DEBUGOUT("Masking off all interrupts\n");
           E1000_WRITE_REG(hw, E1000_IMC, 0xffffffff);
   
           E1000_WRITE_REG(hw, E1000_RCTL, 0);
           E1000_WRITE_REG(hw, E1000_TCTL, E1000_TCTL_PSP);
           E1000_WRITE_FLUSH(hw);
   
           e1000_set_tbi_sbp_82543(hw, false);
   
           /*
            * Delay to allow any outstanding PCI transactions to complete before
            * resetting the device
            */
           msec_delay(10);
   
           ctrl = E1000_READ_REG(hw, E1000_CTRL);
   
           DEBUGOUT("Issuing a global reset to 82543/82544 MAC\n");
           if (hw->mac.type == e1000_82543) {
                   E1000_WRITE_REG(hw, E1000_CTRL, ctrl | E1000_CTRL_RST);
           } else {
                   /*
                    * The 82544 can't ACK the 64-bit write when issuing the
                    * reset, so use IO-mapping as a workaround.
                    */
                   E1000_WRITE_REG_IO(hw, E1000_CTRL, ctrl | E1000_CTRL_RST);
           }
   
           /*
            * After MAC reset, force reload of NVM to restore power-on
            * settings to device.
            */
           hw->nvm.ops.reload(hw);
           msec_delay(2);
   
           /* Masking off and clearing any pending interrupts */
           E1000_WRITE_REG(hw, E1000_IMC, 0xffffffff);
           E1000_READ_REG(hw, E1000_ICR);
   
           return ret_val;
   }
   
   /**
    *  e1000_init_hw_82543 - Initialize hardware
    *  @hw: pointer to the HW structure
    *
    *  This inits the hardware readying it for operation.
    **/
   static s32 e1000_init_hw_82543(struct e1000_hw *hw)
   {
           struct e1000_mac_info *mac = &hw->mac;
           struct e1000_dev_spec_82543 *dev_spec = &hw->dev_spec._82543;
           u32 ctrl;
           s32 ret_val;
           u16 i;
   
           DEBUGFUNC("e1000_init_hw_82543");
   
           /* Disabling VLAN filtering */
           E1000_WRITE_REG(hw, E1000_VET, 0);
           mac->ops.clear_vfta(hw);
   
           /* Setup the receive address. */
           e1000_init_rx_addrs_generic(hw, mac->rar_entry_count);
   
           /* Zero out the Multicast HASH table */
           DEBUGOUT("Zeroing the MTA\n");
           for (i = 0; i < mac->mta_reg_count; i++) {
                   E1000_WRITE_REG_ARRAY(hw, E1000_MTA, i, 0);
                   E1000_WRITE_FLUSH(hw);
           }
   
           /*
            * Set the PCI priority bit correctly in the CTRL register.  This
            * determines if the adapter gives priority to receives, or if it
            * gives equal priority to transmits and receives.
            */
           if (hw->mac.type == e1000_82543 && dev_spec->dma_fairness) {
                   ctrl = E1000_READ_REG(hw, E1000_CTRL);
                   E1000_WRITE_REG(hw, E1000_CTRL, ctrl | E1000_CTRL_PRIOR);
           }
   
           e1000_pcix_mmrbc_workaround_generic(hw);
   
           /* Setup link and flow control */
           ret_val = mac->ops.setup_link(hw);
   
           /*
            * Clear all of the statistics registers (clear on read).  It is
            * important that we do this after we have tried to establish link
            * because the symbol error count will increment wildly if there
           * is no link.
           */
          e1000_clear_hw_cntrs_82543(hw);
  
          return ret_val;
  }
  
  /**
   *  e1000_setup_link_82543 - Setup flow control and link settings
   *  @hw: pointer to the HW structure
   *
   *  Read the EEPROM to determine the initial polarity value and write the
   *  extended device control register with the information before calling
   *  the generic setup link function, which does the following:
   *  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.
   **/
  static s32 e1000_setup_link_82543(struct e1000_hw *hw)
  {
          u32 ctrl_ext;
          s32  ret_val;
          u16 data;
  
          DEBUGFUNC("e1000_setup_link_82543");
  
          /*
           * Take the 4 bits from NVM word 0xF that determine the initial
           * polarity value for the SW controlled pins, and setup the
           * Extended Device Control reg with that info.
           * This is needed because one of the SW controlled pins is used for
           * signal detection.  So this should be done before phy setup.
           */
          if (hw->mac.type == e1000_82543) {
                  ret_val = hw->nvm.ops.read(hw, NVM_INIT_CONTROL2_REG, 1, &data);
                  if (ret_val) {
                          DEBUGOUT("NVM Read Error\n");
                          ret_val = -E1000_ERR_NVM;
                          goto out;
                  }
                  ctrl_ext = ((data & NVM_WORD0F_SWPDIO_EXT_MASK) <<
                              NVM_SWDPIO_EXT_SHIFT);
                  E1000_WRITE_REG(hw, E1000_CTRL_EXT, ctrl_ext);
          }
  
          ret_val = e1000_setup_link_generic(hw);
  
  out:
          return ret_val;
  }
  
  /**
   *  e1000_setup_copper_link_82543 - Configure copper link settings
   *  @hw: pointer to the HW structure
   *
   *  Configures the link for auto-neg or forced speed and duplex.  Then we check
   *  for link, once link is established calls to configure collision distance
   *  and flow control are called.
   **/
  static s32 e1000_setup_copper_link_82543(struct e1000_hw *hw)
  {
          u32 ctrl;
          s32 ret_val;
          bool link = true;
  
          DEBUGFUNC("e1000_setup_copper_link_82543");
  
          ctrl = E1000_READ_REG(hw, E1000_CTRL) | E1000_CTRL_SLU;
          /*
           * With 82543, we need to force speed and duplex on the MAC
           * equal to what the PHY speed and duplex configuration is.
           * In addition, we need to perform a hardware reset on the
           * PHY to take it out of reset.
           */
          if (hw->mac.type == e1000_82543) {
                  ctrl |= (E1000_CTRL_FRCSPD | E1000_CTRL_FRCDPX);
                  E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
                  ret_val = hw->phy.ops.reset(hw);
                  if (ret_val)
                          goto out;
          } else {
                  ctrl &= ~(E1000_CTRL_FRCSPD | E1000_CTRL_FRCDPX);
                  E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
          }
  
          /* Set MDI/MDI-X, Polarity Reversal, and downshift settings */
          ret_val = e1000_copper_link_setup_m88(hw);
          if (ret_val)
                  goto out;
  
          if (hw->mac.autoneg) {
                  /*
                   * Setup autoneg and flow control advertisement and perform
                   * autonegotiation.
                   */
                  ret_val = e1000_copper_link_autoneg(hw);
                  if (ret_val)
                          goto out;
          } else {
                  /*
                   * PHY will be set to 10H, 10F, 100H or 100F
                   * depending on user settings.
                   */
                  DEBUGOUT("Forcing Speed and Duplex\n");
                  ret_val = e1000_phy_force_speed_duplex_82543(hw);
                  if (ret_val) {
                          DEBUGOUT("Error Forcing Speed and Duplex\n");
                          goto out;
                  }
          }
  
          /*
           * Check link status. Wait up to 100 microseconds for link to become
           * valid.
           */
          ret_val = e1000_phy_has_link_generic(hw, COPPER_LINK_UP_LIMIT, 10,
                                               &link);
          if (ret_val)
                  goto out;
  
  
          if (link) {
                  DEBUGOUT("Valid link established!!!\n");
                  /* Config the MAC and PHY after link is up */
                  if (hw->mac.type == e1000_82544) {
                          hw->mac.ops.config_collision_dist(hw);
                  } else {
                          ret_val = e1000_config_mac_to_phy_82543(hw);
                          if (ret_val)
                                  goto out;
                  }
                  ret_val = e1000_config_fc_after_link_up_generic(hw);
          } else {
                  DEBUGOUT("Unable to establish link!!!\n");
          }
  
  out:
          return ret_val;
  }
  
  /**
   *  e1000_setup_fiber_link_82543 - Setup link for fiber
   *  @hw: pointer to the HW structure
   *
   *  Configures collision distance and flow control for fiber links.  Upon
   *  successful setup, poll for link.
   **/
  static s32 e1000_setup_fiber_link_82543(struct e1000_hw *hw)
  {
          u32 ctrl;
          s32 ret_val;
  
          DEBUGFUNC("e1000_setup_fiber_link_82543");
  
          ctrl = E1000_READ_REG(hw, E1000_CTRL);
  
          /* Take the link out of reset */
          ctrl &= ~E1000_CTRL_LRST;
  
          hw->mac.ops.config_collision_dist(hw);
  
          ret_val = e1000_commit_fc_settings_generic(hw);
          if (ret_val)
                  goto out;
  
          DEBUGOUT("Auto-negotiation enabled\n");
  
          E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
          E1000_WRITE_FLUSH(hw);
          msec_delay(1);
  
          /*
           * For these adapters, the SW definable pin 1 is cleared when the
           * optics detect a signal.  If we have a signal, then poll for a
           * "Link-Up" indication.
           */
          if (!(E1000_READ_REG(hw, E1000_CTRL) & E1000_CTRL_SWDPIN1))
                  ret_val = e1000_poll_fiber_serdes_link_generic(hw);
          else
                  DEBUGOUT("No signal detected\n");
  
  out:
          return ret_val;
  }
  
  /**
   *  e1000_check_for_copper_link_82543 - Check for link (Copper)
   *  @hw: pointer to the HW structure
   *
   *  Checks the phy for link, if link exists, do the following:
   *   - check for downshift
   *   - do polarity workaround (if necessary)
   *   - configure collision distance
   *   - configure flow control after link up
   *   - configure tbi compatibility
   **/
  static s32 e1000_check_for_copper_link_82543(struct e1000_hw *hw)
  {
          struct e1000_mac_info *mac = &hw->mac;
          u32 icr, rctl;
          s32 ret_val;
          u16 speed, duplex;
          bool link;
  
          DEBUGFUNC("e1000_check_for_copper_link_82543");
  
          if (!mac->get_link_status) {
                  ret_val = E1000_SUCCESS;
                  goto out;
          }
  
          ret_val = e1000_phy_has_link_generic(hw, 1, 0, &link);
          if (ret_val)
                  goto out;
  
          if (!link)
                  goto out; /* No link detected */
  
          mac->get_link_status = false;
  
          e1000_check_downshift_generic(hw);
  
          /*
           * If we are forcing speed/duplex, then we can return since
           * we have already determined whether we have link or not.
           */
          if (!mac->autoneg) {
                  /*
                   * If speed and duplex are forced to 10H or 10F, then we will
                   * implement the polarity reversal workaround.  We disable
                   * interrupts first, and upon returning, place the devices
                   * interrupt state to its previous value except for the link
                   * status change interrupt which will happened due to the
                   * execution of this workaround.
                   */
                  if (mac->forced_speed_duplex & E1000_ALL_10_SPEED) {
                          E1000_WRITE_REG(hw, E1000_IMC, 0xFFFFFFFF);
                          ret_val = e1000_polarity_reversal_workaround_82543(hw);
                          icr = E1000_READ_REG(hw, E1000_ICR);
                          E1000_WRITE_REG(hw, E1000_ICS, (icr & ~E1000_ICS_LSC));
                          E1000_WRITE_REG(hw, E1000_IMS, IMS_ENABLE_MASK);
                  }
  
                  ret_val = -E1000_ERR_CONFIG;
                  goto out;
          }
  
          /*
           * We have a M88E1000 PHY and Auto-Neg is enabled.  If we
           * have Si on board that is 82544 or newer, Auto
           * Speed Detection takes care of MAC speed/duplex
           * configuration.  So we only need to configure Collision
           * Distance in the MAC.  Otherwise, we need to force
           * speed/duplex on the MAC to the current PHY speed/duplex
           * settings.
           */
          if (mac->type == e1000_82544)
                  hw->mac.ops.config_collision_dist(hw);
          else {
                  ret_val = e1000_config_mac_to_phy_82543(hw);
                  if (ret_val) {
                          DEBUGOUT("Error configuring MAC to PHY settings\n");
                          goto out;
                  }
          }
  
          /*
           * Configure Flow Control now that Auto-Neg has completed.
           * First, we need to restore the desired flow control
           * settings because we may have had to re-autoneg with a
           * different link partner.
           */
          ret_val = e1000_config_fc_after_link_up_generic(hw);
          if (ret_val)
                  DEBUGOUT("Error configuring flow control\n");
  
          /*
           * At this point we know that we are on copper and we have
           * auto-negotiated link.  These are conditions for checking the link
           * partner capability register.  We use the link speed to determine if
           * TBI compatibility needs to be turned on or off.  If the link is not
           * at gigabit speed, then TBI compatibility is not needed.  If we are
           * at gigabit speed, we turn on TBI compatibility.
           */
          if (e1000_tbi_compatibility_enabled_82543(hw)) {
                  ret_val = mac->ops.get_link_up_info(hw, &speed, &duplex);
                  if (ret_val) {
                          DEBUGOUT("Error getting link speed and duplex\n");
                          return ret_val;
                  }
                  if (speed != SPEED_1000) {
                          /*
                           * If link speed is not set to gigabit speed,
                           * we do not need to enable TBI compatibility.
                           */
                          if (e1000_tbi_sbp_enabled_82543(hw)) {
                                  /*
                                   * If we previously were in the mode,
                                   * turn it off.
                                   */
                                  e1000_set_tbi_sbp_82543(hw, false);
                                  rctl = E1000_READ_REG(hw, E1000_RCTL);
                                  rctl &= ~E1000_RCTL_SBP;
                                  E1000_WRITE_REG(hw, E1000_RCTL, rctl);
                          }
                  } else {
                          /*
                           * If TBI compatibility is was previously off,
                           * turn it on. For compatibility with a TBI link
                           * partner, we will store bad packets. Some
                           * frames have an additional byte on the end and
                           * will look like CRC errors to the hardware.
                           */
                          if (!e1000_tbi_sbp_enabled_82543(hw)) {
                                  e1000_set_tbi_sbp_82543(hw, true);
                                  rctl = E1000_READ_REG(hw, E1000_RCTL);
                                  rctl |= E1000_RCTL_SBP;
                                  E1000_WRITE_REG(hw, E1000_RCTL, rctl);
                          }
                  }
          }
  out:
          return ret_val;
  }
  
  /**
   *  e1000_check_for_fiber_link_82543 - 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.
   **/
  static s32 e1000_check_for_fiber_link_82543(struct e1000_hw *hw)
  {
          struct e1000_mac_info *mac = &hw->mac;
          u32 rxcw, ctrl, status;
          s32 ret_val = E1000_SUCCESS;
  
          DEBUGFUNC("e1000_check_for_fiber_link_82543");
  
          ctrl = E1000_READ_REG(hw, E1000_CTRL);
          status = E1000_READ_REG(hw, E1000_STATUS);
          rxcw = E1000_READ_REG(hw, E1000_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) == 0 == have signal */
          if ((!(ctrl & E1000_CTRL_SWDPIN1)) &&
              (!(status & E1000_STATUS_LU)) &&
              (!(rxcw & E1000_RXCW_C))) {
                  if (!mac->autoneg_failed) {
                          mac->autoneg_failed = true;
                          ret_val = 0;
                          goto out;
                  }
                  DEBUGOUT("NOT RXing /C/, disable AutoNeg and force link.\n");
  
                  /* Disable auto-negotiation in the TXCW register */
                  E1000_WRITE_REG(hw, E1000_TXCW, (mac->txcw & ~E1000_TXCW_ANE));
  
                  /* Force link-up and also force full-duplex. */
                  ctrl = E1000_READ_REG(hw, E1000_CTRL);
                  ctrl |= (E1000_CTRL_SLU | E1000_CTRL_FD);
                  E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
  
                  /* Configure Flow Control after forcing link up. */
                  ret_val = e1000_config_fc_after_link_up_generic(hw);
                  if (ret_val) {
                          DEBUGOUT("Error configuring flow control\n");
                          goto out;
                  }
          } 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.
                   */
                  DEBUGOUT("RXing /C/, enable AutoNeg and stop forcing link.\n");
                  E1000_WRITE_REG(hw, E1000_TXCW, mac->txcw);
                  E1000_WRITE_REG(hw, E1000_CTRL, (ctrl & ~E1000_CTRL_SLU));
  
                  mac->serdes_has_link = true;
          }
  
  out:
          return ret_val;
  }
  
  /**
   *  e1000_config_mac_to_phy_82543 - Configure MAC to PHY settings
   *  @hw: pointer to the HW structure
   *
   *  For the 82543 silicon, we need to set the MAC to match the settings
   *  of the PHY, even if the PHY is auto-negotiating.
   **/
  static s32 e1000_config_mac_to_phy_82543(struct e1000_hw *hw)
  {
          u32 ctrl;
          s32 ret_val = E1000_SUCCESS;
          u16 phy_data;
  
          DEBUGFUNC("e1000_config_mac_to_phy_82543");
  
          if (!(hw->phy.ops.read_reg))
                  goto out;
  
          /* Set the bits to force speed and duplex */
          ctrl = E1000_READ_REG(hw, E1000_CTRL);
          ctrl |= (E1000_CTRL_FRCSPD | E1000_CTRL_FRCDPX);
          ctrl &= ~(E1000_CTRL_SPD_SEL | E1000_CTRL_ILOS);
  
          /*
           * Set up duplex in the Device Control and Transmit Control
           * registers depending on negotiated values.
           */
          ret_val = hw->phy.ops.read_reg(hw, M88E1000_PHY_SPEC_STATUS, &phy_data);
          if (ret_val)
                  goto out;
  
          ctrl &= ~E1000_CTRL_FD;
          if (phy_data & M88E1000_PSSR_DPLX)
                  ctrl |= E1000_CTRL_FD;
  
          hw->mac.ops.config_collision_dist(hw);
  
          /*
           * Set up speed in the Device Control register depending on
           * negotiated values.
           */
          if ((phy_data & M88E1000_PSSR_SPEED) == M88E1000_PSSR_1000MBS)
                  ctrl |= E1000_CTRL_SPD_1000;
          else if ((phy_data & M88E1000_PSSR_SPEED) == M88E1000_PSSR_100MBS)
                  ctrl |= E1000_CTRL_SPD_100;
  
          E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
  
  out:
          return ret_val;
  }
  
  /**
   *  e1000_write_vfta_82543 - Write value to VLAN filter table
   *  @hw: pointer to the HW structure
   *  @offset: the 32-bit offset in which to write the value to.
   *  @value: the 32-bit value to write at location offset.
   *
   *  This writes a 32-bit value to a 32-bit offset in the VLAN filter
   *  table.
   **/
  static void e1000_write_vfta_82543(struct e1000_hw *hw, u32 offset, u32 value)
  {
          u32 temp;
  
          DEBUGFUNC("e1000_write_vfta_82543");
  
          if ((hw->mac.type == e1000_82544) && (offset & 1)) {
                  temp = E1000_READ_REG_ARRAY(hw, E1000_VFTA, offset - 1);
                  E1000_WRITE_REG_ARRAY(hw, E1000_VFTA, offset, value);
                  E1000_WRITE_FLUSH(hw);
                  E1000_WRITE_REG_ARRAY(hw, E1000_VFTA, offset - 1, temp);
                  E1000_WRITE_FLUSH(hw);
          } else {
                  e1000_write_vfta_generic(hw, offset, value);
          }
  }
  
  /**
   *  e1000_led_on_82543 - Turn on SW controllable LED
   *  @hw: pointer to the HW structure
   *
   *  Turns the SW defined LED on.
   **/
  static s32 e1000_led_on_82543(struct e1000_hw *hw)
  {
          u32 ctrl = E1000_READ_REG(hw, E1000_CTRL);
  
          DEBUGFUNC("e1000_led_on_82543");
  
          if (hw->mac.type == e1000_82544 &&
              hw->phy.media_type == e1000_media_type_copper) {
                  /* Clear SW-definable Pin 0 to turn on the LED */
                  ctrl &= ~E1000_CTRL_SWDPIN0;
                  ctrl |= E1000_CTRL_SWDPIO0;
          } else {
                  /* Fiber 82544 and all 82543 use this method */
                  ctrl |= E1000_CTRL_SWDPIN0;
                  ctrl |= E1000_CTRL_SWDPIO0;
          }
          E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
  
          return E1000_SUCCESS;
  }
  
  /**
   *  e1000_led_off_82543 - Turn off SW controllable LED
   *  @hw: pointer to the HW structure
   *
   *  Turns the SW defined LED off.
   **/
  static s32 e1000_led_off_82543(struct e1000_hw *hw)
  {
          u32 ctrl = E1000_READ_REG(hw, E1000_CTRL);
  
          DEBUGFUNC("e1000_led_off_82543");
  
          if (hw->mac.type == e1000_82544 &&
              hw->phy.media_type == e1000_media_type_copper) {
                  /* Set SW-definable Pin 0 to turn off the LED */
                  ctrl |= E1000_CTRL_SWDPIN0;
                  ctrl |= E1000_CTRL_SWDPIO0;
          } else {
                  ctrl &= ~E1000_CTRL_SWDPIN0;
                  ctrl |= E1000_CTRL_SWDPIO0;
          }
          E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
  
          return E1000_SUCCESS;
  }
  
  /**
   *  e1000_clear_hw_cntrs_82543 - Clear device specific hardware counters
   *  @hw: pointer to the HW structure
   *
   *  Clears the hardware counters by reading the counter registers.
   **/
  static void e1000_clear_hw_cntrs_82543(struct e1000_hw *hw)
  {
          DEBUGFUNC("e1000_clear_hw_cntrs_82543");
  
          e1000_clear_hw_cntrs_base_generic(hw);
  
          E1000_READ_REG(hw, E1000_PRC64);
          E1000_READ_REG(hw, E1000_PRC127);
          E1000_READ_REG(hw, E1000_PRC255);
          E1000_READ_REG(hw, E1000_PRC511);
          E1000_READ_REG(hw, E1000_PRC1023);
          E1000_READ_REG(hw, E1000_PRC1522);
          E1000_READ_REG(hw, E1000_PTC64);
          E1000_READ_REG(hw, E1000_PTC127);
          E1000_READ_REG(hw, E1000_PTC255);
          E1000_READ_REG(hw, E1000_PTC511);
          E1000_READ_REG(hw, E1000_PTC1023);
          E1000_READ_REG(hw, E1000_PTC1522);
  
          E1000_READ_REG(hw, E1000_ALGNERRC);
          E1000_READ_REG(hw, E1000_RXERRC);
          E1000_READ_REG(hw, E1000_TNCRS);
          E1000_READ_REG(hw, E1000_CEXTERR);
          E1000_READ_REG(hw, E1000_TSCTC);
          E1000_READ_REG(hw, E1000_TSCTFC);
  }
  
  /**
   *  e1000_read_mac_addr_82543 - 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 e1000_read_mac_addr_82543(struct e1000_hw *hw)
  {
          s32  ret_val = E1000_SUCCESS;
          u16 offset, nvm_data, i;
  
          DEBUGFUNC("e1000_read_mac_addr");
  
          for (i = 0; i < ETHER_ADDR_LEN; i += 2) {
                  offset = i >> 1;
                  ret_val = hw->nvm.ops.read(hw, offset, 1, &nvm_data);
                  if (ret_val) {
                          DEBUGOUT("NVM Read Error\n");
                          goto out;
                  }
                  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 (hw->bus.func == E1000_FUNC_1)
                  hw->mac.perm_addr[5] ^= 1;
  
          for (i = 0; i < ETHER_ADDR_LEN; i++)
                  hw->mac.addr[i] = hw->mac.perm_addr[i];
  
  out:
          return ret_val;
  }

Cache object: ca2966af367357ba79176c84957ff68d