e1000_mac.c

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/******************************************************************************
  SPDX-License-Identifier: BSD-3-Clause
 
  Copyright (c) 2001-2020, Intel Corporation
  All rights reserved.
 
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:
 
   1. Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
 
   2. Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
 
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      contributors may be used to endorse or promote products derived from
      this software without specific prior written permission.
 
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  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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******************************************************************************/
/*$FreeBSD$*/
 
#include "e1000_api.h"
 
static s32 e1000_validate_mdi_setting_generic(struct e1000_hw *hw);
static void e1000_set_lan_id_multi_port_pcie(struct e1000_hw *hw);
static void e1000_config_collision_dist_generic(struct e1000_hw *hw);
 
void e1000_init_mac_ops_generic(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        DEBUGFUNC("e1000_init_mac_ops_generic");
 
        /* General Setup */
        mac->ops.init_params = e1000_null_ops_generic;
        mac->ops.init_hw = e1000_null_ops_generic;
        mac->ops.reset_hw = e1000_null_ops_generic;
        mac->ops.setup_physical_interface = e1000_null_ops_generic;
        mac->ops.get_bus_info = e1000_null_ops_generic;
        mac->ops.set_lan_id = e1000_set_lan_id_multi_port_pcie;
        mac->ops.read_mac_addr = e1000_read_mac_addr_generic;
        mac->ops.config_collision_dist = e1000_config_collision_dist_generic;
        mac->ops.clear_hw_cntrs = e1000_null_mac_generic;
        /* LED */
        mac->ops.cleanup_led = e1000_null_ops_generic;
        mac->ops.setup_led = e1000_null_ops_generic;
        mac->ops.blink_led = e1000_null_ops_generic;
        mac->ops.led_on = e1000_null_ops_generic;
        mac->ops.led_off = e1000_null_ops_generic;
        /* LINK */
        mac->ops.setup_link = e1000_null_ops_generic;
        mac->ops.get_link_up_info = e1000_null_link_info;
        mac->ops.check_for_link = e1000_null_ops_generic;
        mac->ops.set_obff_timer = e1000_null_set_obff_timer;
        /* Management */
        mac->ops.check_mng_mode = e1000_null_mng_mode;
        /* VLAN, MC, etc. */
        mac->ops.update_mc_addr_list = e1000_null_update_mc;
        mac->ops.clear_vfta = e1000_null_mac_generic;
        mac->ops.write_vfta = e1000_null_write_vfta;
        mac->ops.rar_set = e1000_rar_set_generic;
        mac->ops.validate_mdi_setting = e1000_validate_mdi_setting_generic;
}
 
s32 e1000_null_ops_generic(struct e1000_hw E1000_UNUSEDARG *hw)
{
        DEBUGFUNC("e1000_null_ops_generic");
        return E1000_SUCCESS;
}
 
void e1000_null_mac_generic(struct e1000_hw E1000_UNUSEDARG *hw)
{
        DEBUGFUNC("e1000_null_mac_generic");
        return;
}
 
s32 e1000_null_link_info(struct e1000_hw E1000_UNUSEDARG *hw,
                         u16 E1000_UNUSEDARG *s, u16 E1000_UNUSEDARG *d)
{
        DEBUGFUNC("e1000_null_link_info");
        return E1000_SUCCESS;
}
 
bool e1000_null_mng_mode(struct e1000_hw E1000_UNUSEDARG *hw)
{
        DEBUGFUNC("e1000_null_mng_mode");
        return false;
}
 
void e1000_null_update_mc(struct e1000_hw E1000_UNUSEDARG *hw,
                          u8 E1000_UNUSEDARG *h, u32 E1000_UNUSEDARG a)
{
        DEBUGFUNC("e1000_null_update_mc");
        return;
}
 
void e1000_null_write_vfta(struct e1000_hw E1000_UNUSEDARG *hw,
                           u32 E1000_UNUSEDARG a, u32 E1000_UNUSEDARG b)
{
        DEBUGFUNC("e1000_null_write_vfta");
        return;
}
 
int e1000_null_rar_set(struct e1000_hw E1000_UNUSEDARG *hw,
                        u8 E1000_UNUSEDARG *h, u32 E1000_UNUSEDARG a)
{
        DEBUGFUNC("e1000_null_rar_set");
        return E1000_SUCCESS;
}
 
s32 e1000_null_set_obff_timer(struct e1000_hw E1000_UNUSEDARG *hw,
                              u32 E1000_UNUSEDARG a)
{
        DEBUGFUNC("e1000_null_set_obff_timer");
        return E1000_SUCCESS;
}
 
s32 e1000_get_bus_info_pci_generic(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        struct e1000_bus_info *bus = &hw->bus;
        u32 status = E1000_READ_REG(hw, E1000_STATUS);
        s32 ret_val = E1000_SUCCESS;
 
        DEBUGFUNC("e1000_get_bus_info_pci_generic");
 
        /* PCI or PCI-X? */
        bus->type = (status & E1000_STATUS_PCIX_MODE)
                        ? e1000_bus_type_pcix
                        : e1000_bus_type_pci;
 
        /* Bus speed */
        if (bus->type == e1000_bus_type_pci) {
                bus->speed = (status & E1000_STATUS_PCI66)
                             ? e1000_bus_speed_66
                             : e1000_bus_speed_33;
        } else {
                switch (status & E1000_STATUS_PCIX_SPEED) {
                case E1000_STATUS_PCIX_SPEED_66:
                        bus->speed = e1000_bus_speed_66;
                        break;
                case E1000_STATUS_PCIX_SPEED_100:
                        bus->speed = e1000_bus_speed_100;
                        break;
                case E1000_STATUS_PCIX_SPEED_133:
                        bus->speed = e1000_bus_speed_133;
                        break;
                default:
                        bus->speed = e1000_bus_speed_reserved;
                        break;
                }
        }
 
        /* Bus width */
        bus->width = (status & E1000_STATUS_BUS64)
                     ? e1000_bus_width_64
                     : e1000_bus_width_32;
 
        /* Which PCI(-X) function? */
        mac->ops.set_lan_id(hw);
 
        return ret_val;
}
 
s32 e1000_get_bus_info_pcie_generic(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        struct e1000_bus_info *bus = &hw->bus;
        s32 ret_val;
        u16 pcie_link_status;
 
        DEBUGFUNC("e1000_get_bus_info_pcie_generic");
 
        bus->type = e1000_bus_type_pci_express;
 
        ret_val = e1000_read_pcie_cap_reg(hw, PCIE_LINK_STATUS,
                                          &pcie_link_status);
        if (ret_val) {
                bus->width = e1000_bus_width_unknown;
                bus->speed = e1000_bus_speed_unknown;
        } else {
                switch (pcie_link_status & PCIE_LINK_SPEED_MASK) {
                case PCIE_LINK_SPEED_2500:
                        bus->speed = e1000_bus_speed_2500;
                        break;
                case PCIE_LINK_SPEED_5000:
                        bus->speed = e1000_bus_speed_5000;
                        break;
                default:
                        bus->speed = e1000_bus_speed_unknown;
                        break;
                }
 
                bus->width = (enum e1000_bus_width)((pcie_link_status &
                              PCIE_LINK_WIDTH_MASK) >> PCIE_LINK_WIDTH_SHIFT);
        }
 
        mac->ops.set_lan_id(hw);
 
        return E1000_SUCCESS;
}
 
static void e1000_set_lan_id_multi_port_pcie(struct e1000_hw *hw)
{
        struct e1000_bus_info *bus = &hw->bus;
        u32 reg;
 
        /* The status register reports the correct function number
         * for the device regardless of function swap state.
         */
        reg = E1000_READ_REG(hw, E1000_STATUS);
        bus->func = (reg & E1000_STATUS_FUNC_MASK) >> E1000_STATUS_FUNC_SHIFT;
}
 
void e1000_set_lan_id_multi_port_pci(struct e1000_hw *hw)
{
        struct e1000_bus_info *bus = &hw->bus;
        u16 pci_header_type;
        u32 status;
 
        e1000_read_pci_cfg(hw, PCI_HEADER_TYPE_REGISTER, &pci_header_type);
        if (pci_header_type & PCI_HEADER_TYPE_MULTIFUNC) {
                status = E1000_READ_REG(hw, E1000_STATUS);
                bus->func = (status & E1000_STATUS_FUNC_MASK)
                            >> E1000_STATUS_FUNC_SHIFT;
        } else {
                bus->func = 0;
        }
}
 
void e1000_set_lan_id_single_port(struct e1000_hw *hw)
{
        struct e1000_bus_info *bus = &hw->bus;
 
        bus->func = 0;
}
 
void e1000_clear_vfta_generic(struct e1000_hw *hw)
{
        u32 offset;
 
        DEBUGFUNC("e1000_clear_vfta_generic");
 
        for (offset = 0; offset < E1000_VLAN_FILTER_TBL_SIZE; offset++) {
                E1000_WRITE_REG_ARRAY(hw, E1000_VFTA, offset, 0);
                E1000_WRITE_FLUSH(hw);
        }
}
 
void e1000_write_vfta_generic(struct e1000_hw *hw, u32 offset, u32 value)
{
        DEBUGFUNC("e1000_write_vfta_generic");
 
        E1000_WRITE_REG_ARRAY(hw, E1000_VFTA, offset, value);
        E1000_WRITE_FLUSH(hw);
}
 
void e1000_init_rx_addrs_generic(struct e1000_hw *hw, u16 rar_count)
{
        u32 i;
        u8 mac_addr[ETHER_ADDR_LEN] = {0};
 
        DEBUGFUNC("e1000_init_rx_addrs_generic");
 
        /* Setup the receive address */
        DEBUGOUT("Programming MAC Address into RAR[0]\n");
 
        hw->mac.ops.rar_set(hw, hw->mac.addr, 0);
 
        /* Zero out the other (rar_entry_count - 1) receive addresses */
        DEBUGOUT1("Clearing RAR[1-%u]\n", rar_count-1);
        for (i = 1; i < rar_count; i++)
                hw->mac.ops.rar_set(hw, mac_addr, i);
}
 
s32 e1000_check_alt_mac_addr_generic(struct e1000_hw *hw)
{
        u32 i;
        s32 ret_val;
        u16 offset, nvm_alt_mac_addr_offset, nvm_data;
        u8 alt_mac_addr[ETHER_ADDR_LEN];
 
        DEBUGFUNC("e1000_check_alt_mac_addr_generic");
 
        ret_val = hw->nvm.ops.read(hw, NVM_COMPAT, 1, &nvm_data);
        if (ret_val)
                return ret_val;
 
        /* not supported on older hardware or 82573 */
        if ((hw->mac.type < e1000_82571) || (hw->mac.type == e1000_82573))
                return E1000_SUCCESS;
 
        /* Alternate MAC address is handled by the option ROM for 82580
         * and newer. SW support not required.
         */
        if (hw->mac.type >= e1000_82580)
                return E1000_SUCCESS;
 
        ret_val = hw->nvm.ops.read(hw, NVM_ALT_MAC_ADDR_PTR, 1,
                                   &nvm_alt_mac_addr_offset);
        if (ret_val) {
                DEBUGOUT("NVM Read Error\n");
                return ret_val;
        }
 
        if ((nvm_alt_mac_addr_offset == 0xFFFF) ||
            (nvm_alt_mac_addr_offset == 0x0000))
                /* There is no Alternate MAC Address */
                return E1000_SUCCESS;
 
        if (hw->bus.func == E1000_FUNC_1)
                nvm_alt_mac_addr_offset += E1000_ALT_MAC_ADDRESS_OFFSET_LAN1;
        if (hw->bus.func == E1000_FUNC_2)
                nvm_alt_mac_addr_offset += E1000_ALT_MAC_ADDRESS_OFFSET_LAN2;
 
        if (hw->bus.func == E1000_FUNC_3)
                nvm_alt_mac_addr_offset += E1000_ALT_MAC_ADDRESS_OFFSET_LAN3;
        for (i = 0; i < ETHER_ADDR_LEN; i += 2) {
                offset = nvm_alt_mac_addr_offset + (i >> 1);
                ret_val = hw->nvm.ops.read(hw, offset, 1, &nvm_data);
                if (ret_val) {
                        DEBUGOUT("NVM Read Error\n");
                        return ret_val;
                }
 
                alt_mac_addr[i] = (u8)(nvm_data & 0xFF);
                alt_mac_addr[i + 1] = (u8)(nvm_data >> 8);
        }
 
        /* if multicast bit is set, the alternate address will not be used */
        if (alt_mac_addr[0] & 0x01) {
                DEBUGOUT("Ignoring Alternate Mac Address with MC bit set\n");
                return E1000_SUCCESS;
        }
 
        /* We have a valid alternate MAC address, and we want to treat it the
         * same as the normal permanent MAC address stored by the HW into the
         * RAR. Do this by mapping this address into RAR0.
         */
        hw->mac.ops.rar_set(hw, alt_mac_addr, 0);
 
        return E1000_SUCCESS;
}
 
int e1000_rar_set_generic(struct e1000_hw *hw, u8 *addr, u32 index)
{
        u32 rar_low, rar_high;
 
        DEBUGFUNC("e1000_rar_set_generic");
 
        /* HW expects these in little endian so we reverse the byte order
         * from network order (big endian) to little endian
         */
        rar_low = ((u32) addr[0] | ((u32) addr[1] << 8) |
                   ((u32) addr[2] << 16) | ((u32) addr[3] << 24));
 
        rar_high = ((u32) addr[4] | ((u32) addr[5] << 8));
 
        /* If MAC address zero, no need to set the AV bit */
        if (rar_low || rar_high)
                rar_high |= E1000_RAH_AV;
 
        /* Some bridges will combine consecutive 32-bit writes into
         * a single burst write, which will malfunction on some parts.
         * The flushes avoid this.
         */
        E1000_WRITE_REG(hw, E1000_RAL(index), rar_low);
        E1000_WRITE_FLUSH(hw);
        E1000_WRITE_REG(hw, E1000_RAH(index), rar_high);
        E1000_WRITE_FLUSH(hw);
 
        return E1000_SUCCESS;
}
 
u32 e1000_hash_mc_addr_generic(struct e1000_hw *hw, u8 *mc_addr)
{
        u32 hash_value, hash_mask;
        u8 bit_shift = 0;
 
        DEBUGFUNC("e1000_hash_mc_addr_generic");
 
        /* 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;
}
 
void e1000_update_mc_addr_list_generic(struct e1000_hw *hw,
                                       u8 *mc_addr_list, u32 mc_addr_count)
{
        u32 hash_value, hash_bit, hash_reg;
        int i;
 
        DEBUGFUNC("e1000_update_mc_addr_list_generic");
 
        /* clear mta_shadow */
        memset(&hw->mac.mta_shadow, 0, sizeof(hw->mac.mta_shadow));
 
        /* update mta_shadow from mc_addr_list */
        for (i = 0; (u32) i < mc_addr_count; i++) {
                hash_value = e1000_hash_mc_addr_generic(hw, mc_addr_list);
 
                hash_reg = (hash_value >> 5) & (hw->mac.mta_reg_count - 1);
                hash_bit = hash_value & 0x1F;
 
                hw->mac.mta_shadow[hash_reg] |= (1 << hash_bit);
                mc_addr_list += (ETHER_ADDR_LEN);
        }
 
        /* replace the entire MTA table */
        for (i = hw->mac.mta_reg_count - 1; i >= 0; i--)
                E1000_WRITE_REG_ARRAY(hw, E1000_MTA, i, hw->mac.mta_shadow[i]);
        E1000_WRITE_FLUSH(hw);
}
 
void e1000_pcix_mmrbc_workaround_generic(struct e1000_hw *hw)
{
        u16 cmd_mmrbc;
        u16 pcix_cmd;
        u16 pcix_stat_hi_word;
        u16 stat_mmrbc;
 
        DEBUGFUNC("e1000_pcix_mmrbc_workaround_generic");
 
        /* Workaround for PCI-X issue when BIOS sets MMRBC incorrectly */
        if (hw->bus.type != e1000_bus_type_pcix)
                return;
 
        e1000_read_pci_cfg(hw, PCIX_COMMAND_REGISTER, &pcix_cmd);
        e1000_read_pci_cfg(hw, PCIX_STATUS_REGISTER_HI, &pcix_stat_hi_word);
        cmd_mmrbc = (pcix_cmd & PCIX_COMMAND_MMRBC_MASK) >>
                     PCIX_COMMAND_MMRBC_SHIFT;
        stat_mmrbc = (pcix_stat_hi_word & PCIX_STATUS_HI_MMRBC_MASK) >>
                      PCIX_STATUS_HI_MMRBC_SHIFT;
        if (stat_mmrbc == PCIX_STATUS_HI_MMRBC_4K)
                stat_mmrbc = PCIX_STATUS_HI_MMRBC_2K;
        if (cmd_mmrbc > stat_mmrbc) {
                pcix_cmd &= ~PCIX_COMMAND_MMRBC_MASK;
                pcix_cmd |= stat_mmrbc << PCIX_COMMAND_MMRBC_SHIFT;
                e1000_write_pci_cfg(hw, PCIX_COMMAND_REGISTER, &pcix_cmd);
        }
}
 
void e1000_clear_hw_cntrs_base_generic(struct e1000_hw *hw)
{
        DEBUGFUNC("e1000_clear_hw_cntrs_base_generic");
 
        E1000_READ_REG(hw, E1000_CRCERRS);
        E1000_READ_REG(hw, E1000_SYMERRS);
        E1000_READ_REG(hw, E1000_MPC);
        E1000_READ_REG(hw, E1000_SCC);
        E1000_READ_REG(hw, E1000_ECOL);
        E1000_READ_REG(hw, E1000_MCC);
        E1000_READ_REG(hw, E1000_LATECOL);
        E1000_READ_REG(hw, E1000_COLC);
        E1000_READ_REG(hw, E1000_DC);
        E1000_READ_REG(hw, E1000_SEC);
        E1000_READ_REG(hw, E1000_RLEC);
        E1000_READ_REG(hw, E1000_XONRXC);
        E1000_READ_REG(hw, E1000_XONTXC);
        E1000_READ_REG(hw, E1000_XOFFRXC);
        E1000_READ_REG(hw, E1000_XOFFTXC);
        E1000_READ_REG(hw, E1000_FCRUC);
        E1000_READ_REG(hw, E1000_GPRC);
        E1000_READ_REG(hw, E1000_BPRC);
        E1000_READ_REG(hw, E1000_MPRC);
        E1000_READ_REG(hw, E1000_GPTC);
        E1000_READ_REG(hw, E1000_GORCL);
        E1000_READ_REG(hw, E1000_GORCH);
        E1000_READ_REG(hw, E1000_GOTCL);
        E1000_READ_REG(hw, E1000_GOTCH);
        E1000_READ_REG(hw, E1000_RNBC);
        E1000_READ_REG(hw, E1000_RUC);
        E1000_READ_REG(hw, E1000_RFC);
        E1000_READ_REG(hw, E1000_ROC);
        E1000_READ_REG(hw, E1000_RJC);
        E1000_READ_REG(hw, E1000_TORL);
        E1000_READ_REG(hw, E1000_TORH);
        E1000_READ_REG(hw, E1000_TOTL);
        E1000_READ_REG(hw, E1000_TOTH);
        E1000_READ_REG(hw, E1000_TPR);
        E1000_READ_REG(hw, E1000_TPT);
        E1000_READ_REG(hw, E1000_MPTC);
        E1000_READ_REG(hw, E1000_BPTC);
}
 
s32 e1000_check_for_copper_link_generic(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        s32 ret_val;
        bool link;
 
        DEBUGFUNC("e1000_check_for_copper_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 E1000_SUCCESS;
 
        /* 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 = e1000_phy_has_link_generic(hw, 1, 0, &link);
        if (ret_val)
                return ret_val;
 
        if (!link)
                return E1000_SUCCESS; /* No link detected */
 
        mac->get_link_status = false;
 
        /* Check if there was DownShift, must be checked
         * immediately after link-up
         */
        e1000_check_downshift_generic(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)
                return -E1000_ERR_CONFIG;
 
        /* Auto-Neg is enabled.  Auto Speed Detection takes care
         * of MAC speed/duplex configuration.  So we only need to
         * configure Collision Distance in the MAC.
         */
        mac->ops.config_collision_dist(hw);
 
        /* Configure Flow Control now that Auto-Neg has completed.
         * First, we need to restore the desired flow control
         * settings because we may have had to re-autoneg with a
         * different link partner.
         */
        ret_val = e1000_config_fc_after_link_up_generic(hw);
        if (ret_val)
                DEBUGOUT("Error configuring flow control\n");
 
        return ret_val;
}
 
s32 e1000_check_for_fiber_link_generic(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        u32 rxcw;
        u32 ctrl;
        u32 status;
        s32 ret_val;
 
        DEBUGFUNC("e1000_check_for_fiber_link_generic");
 
        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) == 1 == have signal */
        if ((ctrl & E1000_CTRL_SWDPIN1) && !(status & E1000_STATUS_LU) &&
            !(rxcw & E1000_RXCW_C)) {
                if (!mac->autoneg_failed) {
                        mac->autoneg_failed = true;
                        return E1000_SUCCESS;
                }
                DEBUGOUT("NOT Rx'ing /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");
                        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.
                 */
                DEBUGOUT("Rx'ing /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;
        }
 
        return E1000_SUCCESS;
}
 
s32 e1000_check_for_serdes_link_generic(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        u32 rxcw;
        u32 ctrl;
        u32 status;
        s32 ret_val;
 
        DEBUGFUNC("e1000_check_for_serdes_link_generic");
 
        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), 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) {
                        mac->autoneg_failed = true;
                        return E1000_SUCCESS;
                }
                DEBUGOUT("NOT Rx'ing /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");
                        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.
                 */
                DEBUGOUT("Rx'ing /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;
        } else if (!(E1000_TXCW_ANE & E1000_READ_REG(hw, E1000_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. */
                usec_delay(10);
                rxcw = E1000_READ_REG(hw, E1000_RXCW);
                if (rxcw & E1000_RXCW_SYNCH) {
                        if (!(rxcw & E1000_RXCW_IV)) {
                                mac->serdes_has_link = true;
                                DEBUGOUT("SERDES: Link up - forced.\n");
                        }
                } else {
                        mac->serdes_has_link = false;
                        DEBUGOUT("SERDES: Link down - force failed.\n");
                }
        }
 
        if (E1000_TXCW_ANE & E1000_READ_REG(hw, E1000_TXCW)) {
                status = E1000_READ_REG(hw, E1000_STATUS);
                if (status & E1000_STATUS_LU) {
                        /* SYNCH bit and IV bit are sticky, so reread rxcw. */
                        usec_delay(10);
                        rxcw = E1000_READ_REG(hw, E1000_RXCW);
                        if (rxcw & E1000_RXCW_SYNCH) {
                                if (!(rxcw & E1000_RXCW_IV)) {
                                        mac->serdes_has_link = true;
                                        DEBUGOUT("SERDES: Link up - autoneg completed successfully.\n");
                                } else {
                                        mac->serdes_has_link = false;
                                        DEBUGOUT("SERDES: Link down - invalid codewords detected in autoneg.\n");
                                }
                        } else {
                                mac->serdes_has_link = false;
                                DEBUGOUT("SERDES: Link down - no sync.\n");
                        }
                } else {
                        mac->serdes_has_link = false;
                        DEBUGOUT("SERDES: Link down - autoneg failed\n");
                }
        }
 
        return E1000_SUCCESS;
}
 
s32 e1000_set_default_fc_generic(struct e1000_hw *hw)
{
        s32 ret_val;
        u16 nvm_data;
        u16 nvm_offset = 0;
 
        DEBUGFUNC("e1000_set_default_fc_generic");
 
        /* 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.
         */
        if (hw->mac.type == e1000_i350) {
                nvm_offset = NVM_82580_LAN_FUNC_OFFSET(hw->bus.func);
                ret_val = hw->nvm.ops.read(hw,
                                           NVM_INIT_CONTROL2_REG +
                                           nvm_offset,
                                           1, &nvm_data);
        } else {
                ret_val = hw->nvm.ops.read(hw,
                                           NVM_INIT_CONTROL2_REG,
                                           1, &nvm_data);
        }
 
 
        if (ret_val) {
                DEBUGOUT("NVM Read Error\n");
                return ret_val;
        }
 
        if (!(nvm_data & NVM_WORD0F_PAUSE_MASK))
                hw->fc.requested_mode = e1000_fc_none;
        else if ((nvm_data & NVM_WORD0F_PAUSE_MASK) ==
                 NVM_WORD0F_ASM_DIR)
                hw->fc.requested_mode = e1000_fc_tx_pause;
        else
                hw->fc.requested_mode = e1000_fc_full;
 
        return E1000_SUCCESS;
}
 
s32 e1000_setup_link_generic(struct e1000_hw *hw)
{
        s32 ret_val;
 
        DEBUGFUNC("e1000_setup_link_generic");
 
        /* In the case of the phy reset being blocked, we already have a link.
         * We do not need to set it up again.
         */
        if (hw->phy.ops.check_reset_block && hw->phy.ops.check_reset_block(hw))
                return E1000_SUCCESS;
 
        /* If requested flow control is set to default, set flow control
         * based on the EEPROM flow control settings.
         */
        if (hw->fc.requested_mode == e1000_fc_default) {
                ret_val = e1000_set_default_fc_generic(hw);
                if (ret_val)
                        return ret_val;
        }
 
        /* Save off the requested flow control mode for use later.  Depending
         * on the link partner's capabilities, we may or may not use this mode.
         */
        hw->fc.current_mode = hw->fc.requested_mode;
 
        DEBUGOUT1("After fix-ups FlowControl is now = %x\n",
                hw->fc.current_mode);
 
        /* Call the necessary media_type subroutine to configure the link. */
        ret_val = hw->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.
         */
        DEBUGOUT("Initializing the Flow Control address, type and timer regs\n");
        E1000_WRITE_REG(hw, E1000_FCT, FLOW_CONTROL_TYPE);
        E1000_WRITE_REG(hw, E1000_FCAH, FLOW_CONTROL_ADDRESS_HIGH);
        E1000_WRITE_REG(hw, E1000_FCAL, FLOW_CONTROL_ADDRESS_LOW);
 
        E1000_WRITE_REG(hw, E1000_FCTTV, hw->fc.pause_time);
 
        return e1000_set_fc_watermarks_generic(hw);
}
 
s32 e1000_commit_fc_settings_generic(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        u32 txcw;
 
        DEBUGFUNC("e1000_commit_fc_settings_generic");
 
        /* 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 (hw->fc.current_mode) {
        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:
                DEBUGOUT("Flow control param set incorrectly\n");
                return -E1000_ERR_CONFIG;
                break;
        }
 
        E1000_WRITE_REG(hw, E1000_TXCW, txcw);
        mac->txcw = txcw;
 
        return E1000_SUCCESS;
}
 
s32 e1000_poll_fiber_serdes_link_generic(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        u32 i, status;
        s32 ret_val;
 
        DEBUGFUNC("e1000_poll_fiber_serdes_link_generic");
 
        /* 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++) {
                msec_delay(10);
                status = E1000_READ_REG(hw, E1000_STATUS);
                if (status & E1000_STATUS_LU)
                        break;
        }
        if (i == FIBER_LINK_UP_LIMIT) {
                DEBUGOUT("Never got a valid link from auto-neg!!!\n");
                mac->autoneg_failed = true;
                /* 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) {
                        DEBUGOUT("Error while checking for link\n");
                        return ret_val;
                }
                mac->autoneg_failed = false;
        } else {
                mac->autoneg_failed = false;
                DEBUGOUT("Valid Link Found\n");
        }
 
        return E1000_SUCCESS;
}
 
s32 e1000_setup_fiber_serdes_link_generic(struct e1000_hw *hw)
{
        u32 ctrl;
        s32 ret_val;
 
        DEBUGFUNC("e1000_setup_fiber_serdes_link_generic");
 
        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)
                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.
         */
        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 set when the optics
         * detect a signal.  If we have a signal, then poll for a "Link-Up"
         * indication.
         */
        if (hw->phy.media_type == e1000_media_type_internal_serdes ||
            (E1000_READ_REG(hw, E1000_CTRL) & E1000_CTRL_SWDPIN1)) {
                ret_val = e1000_poll_fiber_serdes_link_generic(hw);
        } else {
                DEBUGOUT("No signal detected\n");
        }
 
        return ret_val;
}
 
static void e1000_config_collision_dist_generic(struct e1000_hw *hw)
{
        u32 tctl;
 
        DEBUGFUNC("e1000_config_collision_dist_generic");
 
        tctl = E1000_READ_REG(hw, E1000_TCTL);
 
        tctl &= ~E1000_TCTL_COLD;
        tctl |= E1000_COLLISION_DISTANCE << E1000_COLD_SHIFT;
 
        E1000_WRITE_REG(hw, E1000_TCTL, tctl);
        E1000_WRITE_FLUSH(hw);
}
 
s32 e1000_set_fc_watermarks_generic(struct e1000_hw *hw)
{
        u32 fcrtl = 0, fcrth = 0;
 
        DEBUGFUNC("e1000_set_fc_watermarks_generic");
 
        /* 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 (hw->fc.current_mode & 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 = hw->fc.low_water;
                if (hw->fc.send_xon)
                        fcrtl |= E1000_FCRTL_XONE;
 
                fcrth = hw->fc.high_water;
        }
        E1000_WRITE_REG(hw, E1000_FCRTL, fcrtl);
        E1000_WRITE_REG(hw, E1000_FCRTH, fcrth);
 
        return E1000_SUCCESS;
}
 
s32 e1000_force_mac_fc_generic(struct e1000_hw *hw)
{
        u32 ctrl;
 
        DEBUGFUNC("e1000_force_mac_fc_generic");
 
        ctrl = E1000_READ_REG(hw, E1000_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 "hw->fc.current_mode" 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.
         */
        DEBUGOUT1("hw->fc.current_mode = %u\n", hw->fc.current_mode);
 
        switch (hw->fc.current_mode) {
        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:
                DEBUGOUT("Flow control param set incorrectly\n");
                return -E1000_ERR_CONFIG;
        }
 
        E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
 
        return E1000_SUCCESS;
}
 
s32 e1000_config_fc_after_link_up_generic(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
        s32 ret_val = E1000_SUCCESS;
        u32 pcs_status_reg, pcs_adv_reg, pcs_lp_ability_reg, pcs_ctrl_reg;
        u16 mii_status_reg, mii_nway_adv_reg, mii_nway_lp_ability_reg;
        u16 speed, duplex;
 
        DEBUGFUNC("e1000_config_fc_after_link_up_generic");
 
        /* 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->phy.media_type == e1000_media_type_fiber ||
                    hw->phy.media_type == e1000_media_type_internal_serdes)
                        ret_val = e1000_force_mac_fc_generic(hw);
        } else {
                if (hw->phy.media_type == e1000_media_type_copper)
                        ret_val = e1000_force_mac_fc_generic(hw);
        }
 
        if (ret_val) {
                DEBUGOUT("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->phy.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 = hw->phy.ops.read_reg(hw, PHY_STATUS, &mii_status_reg);
                if (ret_val)
                        return ret_val;
                ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS, &mii_status_reg);
                if (ret_val)
                        return ret_val;
 
                if (!(mii_status_reg & MII_SR_AUTONEG_COMPLETE)) {
                        DEBUGOUT("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 = hw->phy.ops.read_reg(hw, PHY_AUTONEG_ADV,
                                               &mii_nway_adv_reg);
                if (ret_val)
                        return ret_val;
                ret_val = hw->phy.ops.read_reg(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 (hw->fc.requested_mode == e1000_fc_full) {
                                hw->fc.current_mode = e1000_fc_full;
                                DEBUGOUT("Flow Control = FULL.\n");
                        } else {
                                hw->fc.current_mode = e1000_fc_rx_pause;
                                DEBUGOUT("Flow Control = Rx PAUSE frames only.\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)) {
                        hw->fc.current_mode = e1000_fc_tx_pause;
                        DEBUGOUT("Flow Control = Tx PAUSE frames only.\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)) {
                        hw->fc.current_mode = e1000_fc_rx_pause;
                        DEBUGOUT("Flow Control = Rx PAUSE frames only.\n");
                } else {
                        /* Per the IEEE spec, at this point flow control
                         * should be disabled.
                         */
                        hw->fc.current_mode = e1000_fc_none;
                        DEBUGOUT("Flow Control = NONE.\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) {
                        DEBUGOUT("Error getting link speed and duplex\n");
                        return ret_val;
                }
 
                if (duplex == HALF_DUPLEX)
                        hw->fc.current_mode = e1000_fc_none;
 
                /* Now we call a subroutine to actually force the MAC
                 * controller to use the correct flow control settings.
                 */
                ret_val = e1000_force_mac_fc_generic(hw);
                if (ret_val) {
                        DEBUGOUT("Error forcing flow control settings\n");
                        return ret_val;
                }
        }
 
        /* Check for the case where we have SerDes 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->phy.media_type == e1000_media_type_internal_serdes) &&
            mac->autoneg) {
                /* Read the PCS_LSTS and check to see if AutoNeg
                 * has completed.
                 */
                pcs_status_reg = E1000_READ_REG(hw, E1000_PCS_LSTAT);
 
                if (!(pcs_status_reg & E1000_PCS_LSTS_AN_COMPLETE)) {
                        DEBUGOUT("PCS 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 (PCS_ANADV) and the Auto_Negotiation Base
                 * Page Ability Register (PCS_LPAB) to determine how
                 * flow control was negotiated.
                 */
                pcs_adv_reg = E1000_READ_REG(hw, E1000_PCS_ANADV);
                pcs_lp_ability_reg = E1000_READ_REG(hw, E1000_PCS_LPAB);
 
                /* Two bits in the Auto Negotiation Advertisement Register
                 * (PCS_ANADV) and two bits in the Auto Negotiation Base
                 * Page Ability Register (PCS_LPAB) 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 ((pcs_adv_reg & E1000_TXCW_PAUSE) &&
                    (pcs_lp_ability_reg & E1000_TXCW_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 (hw->fc.requested_mode == e1000_fc_full) {
                                hw->fc.current_mode = e1000_fc_full;
                                DEBUGOUT("Flow Control = FULL.\n");
                        } else {
                                hw->fc.current_mode = e1000_fc_rx_pause;
                                DEBUGOUT("Flow Control = Rx PAUSE frames only.\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 (!(pcs_adv_reg & E1000_TXCW_PAUSE) &&
                          (pcs_adv_reg & E1000_TXCW_ASM_DIR) &&
                          (pcs_lp_ability_reg & E1000_TXCW_PAUSE) &&
                          (pcs_lp_ability_reg & E1000_TXCW_ASM_DIR)) {
                        hw->fc.current_mode = e1000_fc_tx_pause;
                        DEBUGOUT("Flow Control = Tx PAUSE frames only.\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 ((pcs_adv_reg & E1000_TXCW_PAUSE) &&
                         (pcs_adv_reg & E1000_TXCW_ASM_DIR) &&
                         !(pcs_lp_ability_reg & E1000_TXCW_PAUSE) &&
                         (pcs_lp_ability_reg & E1000_TXCW_ASM_DIR)) {
                        hw->fc.current_mode = e1000_fc_rx_pause;
                        DEBUGOUT("Flow Control = Rx PAUSE frames only.\n");
                } else {
                        /* Per the IEEE spec, at this point flow control
                         * should be disabled.
                         */
                        hw->fc.current_mode = e1000_fc_none;
                        DEBUGOUT("Flow Control = NONE.\n");
                }
 
                /* Now we call a subroutine to actually force the MAC
                 * controller to use the correct flow control settings.
                 */
                pcs_ctrl_reg = E1000_READ_REG(hw, E1000_PCS_LCTL);
                pcs_ctrl_reg |= E1000_PCS_LCTL_FORCE_FCTRL;
                E1000_WRITE_REG(hw, E1000_PCS_LCTL, pcs_ctrl_reg);
 
                ret_val = e1000_force_mac_fc_generic(hw);
                if (ret_val) {
                        DEBUGOUT("Error forcing flow control settings\n");
                        return ret_val;
                }
        }
 
        return E1000_SUCCESS;
}
 
s32 e1000_get_speed_and_duplex_copper_generic(struct e1000_hw *hw, u16 *speed,
                                              u16 *duplex)
{
        u32 status;
 
        DEBUGFUNC("e1000_get_speed_and_duplex_copper_generic");
 
        status = E1000_READ_REG(hw, E1000_STATUS);
        if (status & E1000_STATUS_SPEED_1000) {
                *speed = SPEED_1000;
                DEBUGOUT("1000 Mbs, ");
        } else if (status & E1000_STATUS_SPEED_100) {
                *speed = SPEED_100;
                DEBUGOUT("100 Mbs, ");
        } else {
                *speed = SPEED_10;
                DEBUGOUT("10 Mbs, ");
        }
 
        if (status & E1000_STATUS_FD) {
                *duplex = FULL_DUPLEX;
                DEBUGOUT("Full Duplex\n");
        } else {
                *duplex = HALF_DUPLEX;
                DEBUGOUT("Half Duplex\n");
        }
 
        return E1000_SUCCESS;
}
 
s32 e1000_get_speed_and_duplex_fiber_serdes_generic(struct e1000_hw E1000_UNUSEDARG *hw,
                                                    u16 *speed, u16 *duplex)
{
        DEBUGFUNC("e1000_get_speed_and_duplex_fiber_serdes_generic");
 
        *speed = SPEED_1000;
        *duplex = FULL_DUPLEX;
 
        return E1000_SUCCESS;
}
 
s32 e1000_get_auto_rd_done_generic(struct e1000_hw *hw)
{
        s32 i = 0;
 
        DEBUGFUNC("e1000_get_auto_rd_done_generic");
 
        while (i < AUTO_READ_DONE_TIMEOUT) {
                if (E1000_READ_REG(hw, E1000_EECD) & E1000_EECD_AUTO_RD)
                        break;
                msec_delay(1);
                i++;
        }
 
        if (i == AUTO_READ_DONE_TIMEOUT) {
                DEBUGOUT("Auto read by HW from NVM has not completed.\n");
                return -E1000_ERR_RESET;
        }
 
        return E1000_SUCCESS;
}
 
s32 e1000_valid_led_default_generic(struct e1000_hw *hw, u16 *data)
{
        s32 ret_val;
 
        DEBUGFUNC("e1000_valid_led_default_generic");
 
        ret_val = hw->nvm.ops.read(hw, NVM_ID_LED_SETTINGS, 1, data);
        if (ret_val) {
                DEBUGOUT("NVM Read Error\n");
                return ret_val;
        }
 
        if (*data == ID_LED_RESERVED_0000 || *data == ID_LED_RESERVED_FFFF)
                *data = ID_LED_DEFAULT;
 
        return E1000_SUCCESS;
}
 
s32 e1000_id_led_init_generic(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;
 
        DEBUGFUNC("e1000_id_led_init_generic");
 
        ret_val = hw->nvm.ops.valid_led_default(hw, &data);
        if (ret_val)
                return ret_val;
 
        mac->ledctl_default = E1000_READ_REG(hw, E1000_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 E1000_SUCCESS;
}
 
s32 e1000_setup_led_generic(struct e1000_hw *hw)
{
        u32 ledctl;
 
        DEBUGFUNC("e1000_setup_led_generic");
 
        if (hw->mac.ops.setup_led != e1000_setup_led_generic)
                return -E1000_ERR_CONFIG;
 
        if (hw->phy.media_type == e1000_media_type_fiber) {
                ledctl = E1000_READ_REG(hw, E1000_LEDCTL);
                hw->mac.ledctl_default = ledctl;
                /* Turn off LED0 */
                ledctl &= ~(E1000_LEDCTL_LED0_IVRT | E1000_LEDCTL_LED0_BLINK |
                            E1000_LEDCTL_LED0_MODE_MASK);
                ledctl |= (E1000_LEDCTL_MODE_LED_OFF <<
                           E1000_LEDCTL_LED0_MODE_SHIFT);
                E1000_WRITE_REG(hw, E1000_LEDCTL, ledctl);
        } else if (hw->phy.media_type == e1000_media_type_copper) {
                E1000_WRITE_REG(hw, E1000_LEDCTL, hw->mac.ledctl_mode1);
        }
 
        return E1000_SUCCESS;
}
 
s32 e1000_cleanup_led_generic(struct e1000_hw *hw)
{
        DEBUGFUNC("e1000_cleanup_led_generic");
 
        E1000_WRITE_REG(hw, E1000_LEDCTL, hw->mac.ledctl_default);
        return E1000_SUCCESS;
}
 
s32 e1000_blink_led_generic(struct e1000_hw *hw)
{
        u32 ledctl_blink = 0;
        u32 i;
 
        DEBUGFUNC("e1000_blink_led_generic");
 
        if (hw->phy.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)
                 * (or "off" if inverted) in ledctl_mode2.  The blink
                 * logic in hardware only works when mode is set to "on"
                 * so it must be changed accordingly when the mode is
                 * "off" and inverted.
                 */
                ledctl_blink = hw->mac.ledctl_mode2;
                for (i = 0; i < 32; i += 8) {
                        u32 mode = (hw->mac.ledctl_mode2 >> i) &
                            E1000_LEDCTL_LED0_MODE_MASK;
                        u32 led_default = hw->mac.ledctl_default >> i;
 
                        if ((!(led_default & E1000_LEDCTL_LED0_IVRT) &&
                             (mode == E1000_LEDCTL_MODE_LED_ON)) ||
                            ((led_default & E1000_LEDCTL_LED0_IVRT) &&
                             (mode == E1000_LEDCTL_MODE_LED_OFF))) {
                                ledctl_blink &=
                                    ~(E1000_LEDCTL_LED0_MODE_MASK << i);
                                ledctl_blink |= (E1000_LEDCTL_LED0_BLINK |
                                                 E1000_LEDCTL_MODE_LED_ON) << i;
                        }
                }
        }
 
        E1000_WRITE_REG(hw, E1000_LEDCTL, ledctl_blink);
 
        return E1000_SUCCESS;
}
 
s32 e1000_led_on_generic(struct e1000_hw *hw)
{
        u32 ctrl;
 
        DEBUGFUNC("e1000_led_on_generic");
 
        switch (hw->phy.media_type) {
        case e1000_media_type_fiber:
                ctrl = E1000_READ_REG(hw, E1000_CTRL);
                ctrl &= ~E1000_CTRL_SWDPIN0;
                ctrl |= E1000_CTRL_SWDPIO0;
                E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
                break;
        case e1000_media_type_copper:
                E1000_WRITE_REG(hw, E1000_LEDCTL, hw->mac.ledctl_mode2);
                break;
        default:
                break;
        }
 
        return E1000_SUCCESS;
}
 
s32 e1000_led_off_generic(struct e1000_hw *hw)
{
        u32 ctrl;
 
        DEBUGFUNC("e1000_led_off_generic");
 
        switch (hw->phy.media_type) {
        case e1000_media_type_fiber:
                ctrl = E1000_READ_REG(hw, E1000_CTRL);
                ctrl |= E1000_CTRL_SWDPIN0;
                ctrl |= E1000_CTRL_SWDPIO0;
                E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
                break;
        case e1000_media_type_copper:
                E1000_WRITE_REG(hw, E1000_LEDCTL, hw->mac.ledctl_mode1);
                break;
        default:
                break;
        }
 
        return E1000_SUCCESS;
}
 
void e1000_set_pcie_no_snoop_generic(struct e1000_hw *hw, u32 no_snoop)
{
        u32 gcr;
 
        DEBUGFUNC("e1000_set_pcie_no_snoop_generic");
 
        if (hw->bus.type != e1000_bus_type_pci_express)
                return;
 
        if (no_snoop) {
                gcr = E1000_READ_REG(hw, E1000_GCR);
                gcr &= ~(PCIE_NO_SNOOP_ALL);
                gcr |= no_snoop;
                E1000_WRITE_REG(hw, E1000_GCR, gcr);
        }
}
 
s32 e1000_disable_pcie_master_generic(struct e1000_hw *hw)
{
        u32 ctrl;
        s32 timeout = MASTER_DISABLE_TIMEOUT;
 
        DEBUGFUNC("e1000_disable_pcie_master_generic");
 
        if (hw->bus.type != e1000_bus_type_pci_express)
                return E1000_SUCCESS;
 
        ctrl = E1000_READ_REG(hw, E1000_CTRL);
        ctrl |= E1000_CTRL_GIO_MASTER_DISABLE;
        E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
 
        while (timeout) {
                if (!(E1000_READ_REG(hw, E1000_STATUS) &
                      E1000_STATUS_GIO_MASTER_ENABLE) ||
                                E1000_REMOVED(hw->hw_addr))
                        break;
                usec_delay(100);
                timeout--;
        }
 
        if (!timeout) {
                DEBUGOUT("Master requests are pending.\n");
                return -E1000_ERR_MASTER_REQUESTS_PENDING;
        }
 
        return E1000_SUCCESS;
}
 
void e1000_reset_adaptive_generic(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
 
        DEBUGFUNC("e1000_reset_adaptive_generic");
 
        if (!mac->adaptive_ifs) {
                DEBUGOUT("Not in Adaptive IFS mode!\n");
                return;
        }
 
        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 = false;
        E1000_WRITE_REG(hw, E1000_AIT, 0);
}
 
void e1000_update_adaptive_generic(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;
 
        DEBUGFUNC("e1000_update_adaptive_generic");
 
        if (!mac->adaptive_ifs) {
                DEBUGOUT("Not in Adaptive IFS mode!\n");
                return;
        }
 
        if ((mac->collision_delta * mac->ifs_ratio) > mac->tx_packet_delta) {
                if (mac->tx_packet_delta > MIN_NUM_XMITS) {
                        mac->in_ifs_mode = true;
                        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;
                                E1000_WRITE_REG(hw, E1000_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 = false;
                        E1000_WRITE_REG(hw, E1000_AIT, 0);
                }
        }
}
 
static s32 e1000_validate_mdi_setting_generic(struct e1000_hw *hw)
{
        DEBUGFUNC("e1000_validate_mdi_setting_generic");
 
        if (!hw->mac.autoneg && (hw->phy.mdix == 0 || hw->phy.mdix == 3)) {
                DEBUGOUT("Invalid MDI setting detected\n");
                hw->phy.mdix = 1;
                return -E1000_ERR_CONFIG;
        }
 
        return E1000_SUCCESS;
}
 
s32 e1000_validate_mdi_setting_crossover_generic(struct e1000_hw E1000_UNUSEDARG *hw)
{
        DEBUGFUNC("e1000_validate_mdi_setting_crossover_generic");
 
        return E1000_SUCCESS;
}
 
s32 e1000_write_8bit_ctrl_reg_generic(struct e1000_hw *hw, u32 reg,
                                      u32 offset, u8 data)
{
        u32 i, regvalue = 0;
 
        DEBUGFUNC("e1000_write_8bit_ctrl_reg_generic");
 
        /* Set up the address and data */
        regvalue = ((u32)data) | (offset << E1000_GEN_CTL_ADDRESS_SHIFT);
        E1000_WRITE_REG(hw, reg, regvalue);
 
        /* Poll the ready bit to see if the MDI read completed */
        for (i = 0; i < E1000_GEN_POLL_TIMEOUT; i++) {
                usec_delay(5);
                regvalue = E1000_READ_REG(hw, reg);
                if (regvalue & E1000_GEN_CTL_READY)
                        break;
        }
        if (!(regvalue & E1000_GEN_CTL_READY)) {
                DEBUGOUT1("Reg %08x did not indicate ready\n", reg);
                return -E1000_ERR_PHY;
        }
 
        return E1000_SUCCESS;
}
 
s32 e1000_get_hw_semaphore(struct e1000_hw *hw)
{
        u32 swsm;
        s32 fw_timeout = hw->nvm.word_size + 1;
        s32 sw_timeout = hw->nvm.word_size + 1;
        s32 i = 0;
        
        DEBUGFUNC("e1000_get_hw_semaphore");
 
        /* _82571 */
        /* If we have timedout 3 times on trying to acquire
         * the inter-port SMBI semaphore, there is old code
         * operating on the other port, and it is not
         * releasing SMBI. Modify the number of times that
         * we try for the semaphore to interwork with this
         * older code.
         */
        if (hw->dev_spec._82571.smb_counter > 2)
                sw_timeout = 1;
 
 
        /* Get the SW semaphore */
        while (i < sw_timeout) {
                swsm = E1000_READ_REG(hw, E1000_SWSM);
                if (!(swsm & E1000_SWSM_SMBI))
                        break;
 
                usec_delay(50);
                i++;
        }
 
        if (i == sw_timeout) {
                DEBUGOUT("Driver can't access device - SMBI bit is set.\n");
                hw->dev_spec._82571.smb_counter++;
        }
 
        /* In rare circumstances, the SW semaphore may already be held
         * unintentionally. Clear the semaphore once before giving up.
         */
        if (hw->dev_spec._82575.clear_semaphore_once) {
                hw->dev_spec._82575.clear_semaphore_once = false;
                e1000_put_hw_semaphore(hw);
                for (i = 0; i < fw_timeout; i++) {
                        swsm = E1000_READ_REG(hw, E1000_SWSM);
                        if (!(swsm & E1000_SWSM_SMBI))
                                break;
 
                        usec_delay(50);
                }
         }
 
        /* Get the FW semaphore. */
        for (i = 0; i < fw_timeout; i++) {
                swsm = E1000_READ_REG(hw, E1000_SWSM);
                E1000_WRITE_REG(hw, E1000_SWSM, swsm | E1000_SWSM_SWESMBI);
 
                /* Semaphore acquired if bit latched */
                if (E1000_READ_REG(hw, E1000_SWSM) & E1000_SWSM_SWESMBI)
                        break;
 
                usec_delay(50);
        }
 
        if (i == fw_timeout) {
                /* Release semaphores */
                e1000_put_hw_semaphore(hw);
                DEBUGOUT("Driver can't access the NVM\n");
                return -E1000_ERR_NVM;
        }
 
        return E1000_SUCCESS;
}
 
void e1000_put_hw_semaphore(struct e1000_hw *hw)
{
        u32 swsm;
 
        DEBUGFUNC("e1000_put_hw_semaphore");
 
        swsm = E1000_READ_REG(hw, E1000_SWSM);
 
        swsm &= ~(E1000_SWSM_SMBI | E1000_SWSM_SWESMBI);
 
        E1000_WRITE_REG(hw, E1000_SWSM, swsm);
}
 
 
s32
e1000_acquire_swfw_sync(struct e1000_hw *hw, u16 mask)
{
        u32 swfw_sync;
        u32 swmask = mask;
        u32 fwmask = mask << 16;
        s32 ret_val = E1000_SUCCESS;
        s32 i = 0, timeout = 200;
 
        DEBUGFUNC("e1000_acquire_swfw_sync");
        ASSERT_NO_LOCKS();
        while (i < timeout) {
                if (e1000_get_hw_semaphore(hw)) {
                        ret_val = -E1000_ERR_SWFW_SYNC;
                        goto out;
                }
 
                swfw_sync = E1000_READ_REG(hw, E1000_SW_FW_SYNC);
                if (!(swfw_sync & (fwmask | swmask)))
                        break;
 
                /*
                 * Firmware currently using resource (fwmask)
                 * or other software thread using resource (swmask)
                 */
                e1000_put_hw_semaphore(hw);
                msec_delay_irq(5);
                i++;
        }
 
        if (i == timeout) {
                DEBUGOUT("Driver can't access resource, SW_FW_SYNC timeout.\n");
                ret_val = -E1000_ERR_SWFW_SYNC;
                goto out;
        }
 
        swfw_sync |= swmask;
        E1000_WRITE_REG(hw, E1000_SW_FW_SYNC, swfw_sync);
 
        e1000_put_hw_semaphore(hw);
 
out:
        return ret_val;
}
 
void
e1000_release_swfw_sync(struct e1000_hw *hw, u16 mask)
{
        u32 swfw_sync;
 
        DEBUGFUNC("e1000_release_swfw_sync");
 
        while (e1000_get_hw_semaphore(hw) != E1000_SUCCESS)
                ; /* Empty */
 
        swfw_sync = E1000_READ_REG(hw, E1000_SW_FW_SYNC);
        swfw_sync &= (u32)~mask;
        E1000_WRITE_REG(hw, E1000_SW_FW_SYNC, swfw_sync);
 
        e1000_put_hw_semaphore(hw);
}