e1000_hw.c

82546千兆网卡驱动程序,支持该系列所有芯片

    ret_val = e1000_read_eeprom(hw, EEPROM_SERDES_AMPLITUDE, 1, &eeprom_data);
    if (ret_val) {
        return ret_val;
    }

    if (eeprom_data != EEPROM_RESERVED_WORD) {
        /* Adjust SERDES output amplitude only. */
        eeprom_data &= EEPROM_SERDES_AMPLITUDE_MASK;
        ret_val = e1000_write_phy_reg(hw, M88E1000_PHY_EXT_CTRL, eeprom_data);
        if (ret_val)
            return ret_val;
    }

    return E1000_SUCCESS;
}

/******************************************************************************
 * Configures flow control and link settings.
 *
 * hw - Struct containing variables accessed by shared code
 *
 * Determines which flow control settings to use. Calls the apropriate media-
 * specific link configuration function. Configures the flow control settings.
 * 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.
 *****************************************************************************/
int32_t
e1000_setup_link(struct e1000_hw *hw)
{
    uint32_t ctrl_ext;
    int32_t ret_val;
    uint16_t eeprom_data;

    DEBUGFUNC("e1000_setup_link");

    /* In the case of the phy reset being blocked, we already have a link.
     * We do not have to set it up again. */
    if (e1000_check_phy_reset_block(hw))
        return E1000_SUCCESS;

    /* 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->fc == E1000_FC_DEFAULT) {
        switch (hw->mac_type) {
        case e1000_ich8lan:
        case e1000_82573:
            hw->fc = E1000_FC_FULL;
            break;
        default:
            ret_val = e1000_read_eeprom(hw, EEPROM_INIT_CONTROL2_REG,
                                        1, &eeprom_data);
            if (ret_val) {
                DEBUGOUT("EEPROM Read Error\n");
                return -E1000_ERR_EEPROM;
            }
            if ((eeprom_data & EEPROM_WORD0F_PAUSE_MASK) == 0)
                hw->fc = E1000_FC_NONE;
            else if ((eeprom_data & EEPROM_WORD0F_PAUSE_MASK) ==
                    EEPROM_WORD0F_ASM_DIR)
                hw->fc = E1000_FC_TX_PAUSE;
            else
                hw->fc = E1000_FC_FULL;
            break;
        }
    }

    /* We want to save off the original Flow Control configuration just
     * in case we get disconnected and then reconnected into a different
     * hub or switch with different Flow Control capabilities.
     */
    if (hw->mac_type == e1000_82542_rev2_0)
        hw->fc &= (~E1000_FC_TX_PAUSE);

    if ((hw->mac_type < e1000_82543) && (hw->report_tx_early == 1))
        hw->fc &= (~E1000_FC_RX_PAUSE);

    hw->original_fc = hw->fc;

    DEBUGOUT1("After fix-ups FlowControl is now = %x\n", hw->fc);

    /* Take the 4 bits from EEPROM word 0x0F 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 e1000_setup_pcs_link()
     * or e1000_phy_setup() is called.
     */
    if (hw->mac_type == e1000_82543) {
        ret_val = e1000_read_eeprom(hw, EEPROM_INIT_CONTROL2_REG,
                                    1, &eeprom_data);
        if (ret_val) {
            DEBUGOUT("EEPROM Read Error\n");
            return -E1000_ERR_EEPROM;
        }
        ctrl_ext = ((eeprom_data & EEPROM_WORD0F_SWPDIO_EXT) <<
                    SWDPIO__EXT_SHIFT);
        E1000_WRITE_REG(hw, CTRL_EXT, ctrl_ext);
    }

    /* Call the necessary subroutine to configure the link. */
    ret_val = (hw->media_type == e1000_media_type_copper) ?
              e1000_setup_copper_link(hw) :
              e1000_setup_fiber_serdes_link(hw);

    /* 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");

    /* FCAL/H and FCT are hardcoded to standard values in e1000_ich8lan. */
    if (hw->mac_type != e1000_ich8lan) {
        E1000_WRITE_REG(hw, FCT, FLOW_CONTROL_TYPE);
        E1000_WRITE_REG(hw, FCAH, FLOW_CONTROL_ADDRESS_HIGH);
        E1000_WRITE_REG(hw, FCAL, FLOW_CONTROL_ADDRESS_LOW);
    }

    E1000_WRITE_REG(hw, FCTTV, hw->fc_pause_time);

    /* 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 in not enabled, then these
     * registers will be set to 0.
     */
    if (!(hw->fc & E1000_FC_TX_PAUSE)) {
        E1000_WRITE_REG(hw, FCRTL, 0);
        E1000_WRITE_REG(hw, FCRTH, 0);
    } else {
        /* We need to set up the Receive Threshold high and low water marks
         * as well as (optionally) enabling the transmission of XON frames.
         */
        if (hw->fc_send_xon) {
            E1000_WRITE_REG(hw, FCRTL, (hw->fc_low_water | E1000_FCRTL_XONE));
            E1000_WRITE_REG(hw, FCRTH, hw->fc_high_water);
        } else {
            E1000_WRITE_REG(hw, FCRTL, hw->fc_low_water);
            E1000_WRITE_REG(hw, FCRTH, hw->fc_high_water);
        }
    }
    return ret_val;
}

/******************************************************************************
 * Sets up link for a fiber based or serdes based adapter
 *
 * hw - Struct containing variables accessed by shared code
 *
 * Manipulates Physical Coding Sublayer functions in order to configure
 * link. Assumes the hardware has been previously reset and the transmitter
 * and receiver are not enabled.
 *****************************************************************************/
static int32_t
e1000_setup_fiber_serdes_link(struct e1000_hw *hw)
{
    uint32_t ctrl;
    uint32_t status;
    uint32_t txcw = 0;
    uint32_t i;
    uint32_t signal = 0;
    int32_t ret_val;

    DEBUGFUNC("e1000_setup_fiber_serdes_link");

    /* On 82571 and 82572 Fiber connections, SerDes loopback mode persists
     * until explicitly turned off or a power cycle is performed.  A read to
     * the register does not indicate its status.  Therefore, we ensure
     * loopback mode is disabled during initialization.
     */
    if (hw->mac_type == e1000_82571 || hw->mac_type == e1000_82572)
        E1000_WRITE_REG(hw, SCTL, E1000_DISABLE_SERDES_LOOPBACK);

    /* On adapters with a MAC newer than 82544, SWDP 1 will be
     * set when the optics detect a signal. On older adapters, it will be
     * cleared when there is a signal.  This applies to fiber media only.
     * If we're on serdes media, adjust the output amplitude to value
     * set in the EEPROM.
     */
    ctrl = E1000_READ_REG(hw, CTRL);
    if (hw->media_type == e1000_media_type_fiber)
        signal = (hw->mac_type > e1000_82544) ? E1000_CTRL_SWDPIN1 : 0;

    ret_val = e1000_adjust_serdes_amplitude(hw);
    if (ret_val)
        return ret_val;

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

    /* Adjust VCO speed to improve BER performance */
    ret_val = e1000_set_vco_speed(hw);
    if (ret_val)
        return ret_val;

    e1000_config_collision_dist(hw);

    /* 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 Tranmsit
     * 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) {
    case E1000_FC_NONE:
        /* Flow control is 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;
    }

    /* 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-neogtiation 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, TXCW, txcw);
    E1000_WRITE_REG(hw, CTRL, ctrl);
    E1000_WRITE_FLUSH(hw);

    hw->txcw = txcw;
    msec_delay(1);

    /* If we have a signal (the cable is plugged in) 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 internal serdes, we just assume a signal is present, then poll.
     */
    if (hw->media_type == e1000_media_type_internal_serdes ||
       (E1000_READ_REG(hw, CTRL) & E1000_CTRL_SWDPIN1) == signal) {
        DEBUGOUT("Looking for Link\n");
        for (i = 0; i < (LINK_UP_TIMEOUT / 10); i++) {
            msec_delay(10);
            status = E1000_READ_REG(hw, STATUS);
            if (status & E1000_STATUS_LU) break;
        }
        if (i == (LINK_UP_TIMEOUT / 10)) {
            DEBUGOUT("Never got a valid link from auto-neg!!!\n");
            hw->autoneg_failed = 1;
            /* AutoNeg failed to achieve a link, so we'll call
             * e1000_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 = e1000_check_for_link(hw);
            if (ret_val) {
                DEBUGOUT("Error while checking for link\n");
                return ret_val;
            }
            hw->autoneg_failed = 0;
        } else {
            hw->autoneg_failed = 0;
            DEBUGOUT("Valid Link Found\n");
        }
    } else {
        DEBUGOUT("No Signal Detected\n");
    }
    return E1000_SUCCESS;
}

/******************************************************************************
* Make sure we have a valid PHY and change PHY mode before link setup.
*
* hw - Struct containing variables accessed by shared code
******************************************************************************/
static int32_t
e1000_copper_link_preconfig(struct e1000_hw *hw)
{
    uint32_t ctrl;
    int32_t ret_val;
    uint16_t phy_data;

    DEBUGFUNC("e1000_copper_link_preconfig");

    ctrl = E1000_READ_REG(hw, CTRL);
    /* 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_SLU;
        ctrl &= ~(E1000_CTRL_FRCSPD | E1000_CTRL_FRCDPX);
        E1000_WRITE_REG(hw, CTRL, ctrl);
    } else {
        ctrl |= (E1000_CTRL_FRCSPD | E1000_CTRL_FRCDPX | E1000_CTRL_SLU);
        E1000_WRITE_REG(hw, CTRL, ctrl);
        ret_val = e1000_phy_hw_reset(hw);
        if (ret_val)
            return ret_val;
    }

    /* Make sure we have a valid PHY */
    ret_val = e1000_detect_gig_phy(hw);
    if (ret_val) {
        DEBUGOUT("Error, did not detect valid phy.\n");
        return ret_val;
    }
    DEBUGOUT1("Phy ID = %x \n", hw->phy_id);

    /* Set PHY to class A mode (if necessary) */
    ret_val = e1000_set_phy_mode(hw);
    if (ret_val)
        return ret_val;

    if ((hw->mac_type == e1000_82545_rev_3) ||
       (hw->mac_type == e1000_82546_rev_3)) {
        ret_val = e1000_read_phy_reg(hw, M88E1000_PHY_SPEC_CTRL, &phy_data);
        phy_data |= 0x00000008;
        ret_val = e1000_write_phy_reg(hw, M88E1000_PHY_SPEC_CTRL, phy_data);