e1000_phy.c

DELL755 Intel 网卡驱动

s32 e1000_check_polarity_m88(struct e1000_hw *hw)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32 ret_val;
	u16 data;

	DEBUGFUNC("e1000_check_polarity_m88");

	ret_val = phy->ops.read_reg(hw, M88E1000_PHY_SPEC_STATUS, &data);

	if (!ret_val)
		phy->cable_polarity = (data & M88E1000_PSSR_REV_POLARITY)
		                      ? e1000_rev_polarity_reversed
		                      : e1000_rev_polarity_normal;

	return ret_val;
}

/**
 *  e1000_check_polarity_igp - Checks the polarity.
 *  @hw: pointer to the HW structure
 *
 *  Success returns 0, Failure returns -E1000_ERR_PHY (-2)
 *
 *  Polarity is determined based on the PHY port status register, and the
 *  current speed (since there is no polarity at 100Mbps).
 **/
s32 e1000_check_polarity_igp(struct e1000_hw *hw)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32 ret_val;
	u16 data, offset, mask;

	DEBUGFUNC("e1000_check_polarity_igp");

	/*
	 * Polarity is determined based on the speed of
	 * our connection.
	 */
	ret_val = phy->ops.read_reg(hw, IGP01E1000_PHY_PORT_STATUS, &data);
	if (ret_val)
		goto out;

	if ((data & IGP01E1000_PSSR_SPEED_MASK) ==
	    IGP01E1000_PSSR_SPEED_1000MBPS) {
		offset	= IGP01E1000_PHY_PCS_INIT_REG;
		mask	= IGP01E1000_PHY_POLARITY_MASK;
	} else {
		/*
		 * This really only applies to 10Mbps since
		 * there is no polarity for 100Mbps (always 0).
		 */
		offset	= IGP01E1000_PHY_PORT_STATUS;
		mask	= IGP01E1000_PSSR_POLARITY_REVERSED;
	}

	ret_val = phy->ops.read_reg(hw, offset, &data);

	if (!ret_val)
		phy->cable_polarity = (data & mask)
		                      ? e1000_rev_polarity_reversed
		                      : e1000_rev_polarity_normal;

out:
	return ret_val;
}

/**
 *  e1000_wait_autoneg_generic - Wait for auto-neg completion
 *  @hw: pointer to the HW structure
 *
 *  Waits for auto-negotiation to complete or for the auto-negotiation time
 *  limit to expire, which ever happens first.
 **/
s32 e1000_wait_autoneg_generic(struct e1000_hw *hw)
{
	s32 ret_val = E1000_SUCCESS;
	u16 i, phy_status;

	DEBUGFUNC("e1000_wait_autoneg_generic");

	if (!(hw->phy.ops.read_reg))
		return E1000_SUCCESS;

	/* Break after autoneg completes or PHY_AUTO_NEG_LIMIT expires. */
	for (i = PHY_AUTO_NEG_LIMIT; i > 0; i--) {
		ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS, &phy_status);
		if (ret_val)
			break;
		ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS, &phy_status);
		if (ret_val)
			break;
		if (phy_status & MII_SR_AUTONEG_COMPLETE)
			break;
		msec_delay(100);
	}

	/*
	 * PHY_AUTO_NEG_TIME expiration doesn't guarantee auto-negotiation
	 * has completed.
	 */
	return ret_val;
}

/**
 *  e1000_phy_has_link_generic - Polls PHY for link
 *  @hw: pointer to the HW structure
 *  @iterations: number of times to poll for link
 *  @usec_interval: delay between polling attempts
 *  @success: pointer to whether polling was successful or not
 *
 *  Polls the PHY status register for link, 'iterations' number of times.
 **/
s32 e1000_phy_has_link_generic(struct e1000_hw *hw, u32 iterations,
                               u32 usec_interval, bool *success)
{
	s32 ret_val = E1000_SUCCESS;
	u16 i, phy_status;

	DEBUGFUNC("e1000_phy_has_link_generic");

	if (!(hw->phy.ops.read_reg))
		return E1000_SUCCESS;

	for (i = 0; i < iterations; i++) {
		/*
		 * Some PHYs require the PHY_STATUS register to be read
		 * twice due to the link bit being sticky.  No harm doing
		 * it across the board.
		 */
		ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS, &phy_status);
		if (ret_val)
			break;
		ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS, &phy_status);
		if (ret_val)
			break;
		if (phy_status & MII_SR_LINK_STATUS)
			break;
		if (usec_interval >= 1000)
			msec_delay_irq(usec_interval/1000);
		else
			usec_delay(usec_interval);
	}

	*success = (i < iterations) ? true : false;

	return ret_val;
}

/**
 *  e1000_get_cable_length_m88 - Determine cable length for m88 PHY
 *  @hw: pointer to the HW structure
 *
 *  Reads the PHY specific status register to retrieve the cable length
 *  information.  The cable length is determined by averaging the minimum and
 *  maximum values to get the "average" cable length.  The m88 PHY has four
 *  possible cable length values, which are:
 *	Register Value		Cable Length
 *	0			< 50 meters
 *	1			50 - 80 meters
 *	2			80 - 110 meters
 *	3			110 - 140 meters
 *	4			> 140 meters
 **/
s32 e1000_get_cable_length_m88(struct e1000_hw *hw)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32 ret_val;
	u16 phy_data, index;

	DEBUGFUNC("e1000_get_cable_length_m88");

	ret_val = phy->ops.read_reg(hw, M88E1000_PHY_SPEC_STATUS, &phy_data);
	if (ret_val)
		goto out;

	index = (phy_data & M88E1000_PSSR_CABLE_LENGTH) >>
	        M88E1000_PSSR_CABLE_LENGTH_SHIFT;
	phy->min_cable_length = e1000_m88_cable_length_table[index];
	phy->max_cable_length = e1000_m88_cable_length_table[index+1];

	phy->cable_length = (phy->min_cable_length + phy->max_cable_length) / 2;

out:
	return ret_val;
}

/**
 *  e1000_get_cable_length_igp_2 - Determine cable length for igp2 PHY
 *  @hw: pointer to the HW structure
 *
 *  The automatic gain control (agc) normalizes the amplitude of the
 *  received signal, adjusting for the attenuation produced by the
 *  cable.  By reading the AGC registers, which represent the
 *  combination of coarse and fine gain value, the value can be put
 *  into a lookup table to obtain the approximate cable length
 *  for each channel.
 **/
s32 e1000_get_cable_length_igp_2(struct e1000_hw *hw)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32 ret_val = E1000_SUCCESS;
	u16 phy_data, i, agc_value = 0;
	u16 cur_agc_index, max_agc_index = 0;
	u16 min_agc_index = IGP02E1000_CABLE_LENGTH_TABLE_SIZE - 1;
	u16 agc_reg_array[IGP02E1000_PHY_CHANNEL_NUM] =
	                                                 {IGP02E1000_PHY_AGC_A,
	                                                  IGP02E1000_PHY_AGC_B,
	                                                  IGP02E1000_PHY_AGC_C,
	                                                  IGP02E1000_PHY_AGC_D};

	DEBUGFUNC("e1000_get_cable_length_igp_2");

	/* Read the AGC registers for all channels */
	for (i = 0; i < IGP02E1000_PHY_CHANNEL_NUM; i++) {
		ret_val = phy->ops.read_reg(hw, agc_reg_array[i], &phy_data);
		if (ret_val)
			goto out;

		/*
		 * Getting bits 15:9, which represent the combination of
		 * coarse and fine gain values.  The result is a number
		 * that can be put into the lookup table to obtain the
		 * approximate cable length.
		 */
		cur_agc_index = (phy_data >> IGP02E1000_AGC_LENGTH_SHIFT) &
		                IGP02E1000_AGC_LENGTH_MASK;

		/* Array index bound check. */
		if ((cur_agc_index >= IGP02E1000_CABLE_LENGTH_TABLE_SIZE) ||
		    (cur_agc_index == 0)) {
			ret_val = -E1000_ERR_PHY;
			goto out;
		}

		/* Remove min & max AGC values from calculation. */
		if (e1000_igp_2_cable_length_table[min_agc_index] >
		    e1000_igp_2_cable_length_table[cur_agc_index])
			min_agc_index = cur_agc_index;
		if (e1000_igp_2_cable_length_table[max_agc_index] <
		    e1000_igp_2_cable_length_table[cur_agc_index])
			max_agc_index = cur_agc_index;

		agc_value += e1000_igp_2_cable_length_table[cur_agc_index];
	}

	agc_value -= (e1000_igp_2_cable_length_table[min_agc_index] +
	              e1000_igp_2_cable_length_table[max_agc_index]);
	agc_value /= (IGP02E1000_PHY_CHANNEL_NUM - 2);

	/* Calculate cable length with the error range of +/- 10 meters. */
	phy->min_cable_length = ((agc_value - IGP02E1000_AGC_RANGE) > 0) ?
	                         (agc_value - IGP02E1000_AGC_RANGE) : 0;
	phy->max_cable_length = agc_value + IGP02E1000_AGC_RANGE;

	phy->cable_length = (phy->min_cable_length + phy->max_cable_length) / 2;

out:
	return ret_val;
}

/**
 *  e1000_get_phy_info_m88 - Retrieve PHY information
 *  @hw: pointer to the HW structure
 *
 *  Valid for only copper links.  Read the PHY status register (sticky read)
 *  to verify that link is up.  Read the PHY special control register to
 *  determine the polarity and 10base-T extended distance.  Read the PHY
 *  special status register to determine MDI/MDIx and current speed.  If
 *  speed is 1000, then determine cable length, local and remote receiver.
 **/
s32 e1000_get_phy_info_m88(struct e1000_hw *hw)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32  ret_val;
	u16 phy_data;
	bool link;

	DEBUGFUNC("e1000_get_phy_info_m88");

	if (hw->phy.media_type != e1000_media_type_copper) {
		DEBUGOUT("Phy info is only valid for copper media\n");
		ret_val = -E1000_ERR_CONFIG;
		goto out;
	}

	ret_val = e1000_phy_has_link_generic(hw, 1, 0, &link);
	if (ret_val)
		goto out;

	if (!link) {
		DEBUGOUT("Phy info is only valid if link is up\n");
		ret_val = -E1000_ERR_CONFIG;
		goto out;
	}

	ret_val = phy->ops.read_reg(hw, M88E1000_PHY_SPEC_CTRL, &phy_data);
	if (ret_val)
		goto out;

	phy->polarity_correction = (phy_data & M88E1000_PSCR_POLARITY_REVERSAL)
	                           ? true
	                           : false;

	ret_val = e1000_check_polarity_m88(hw);
	if (ret_val)
		goto out;

	ret_val = phy->ops.read_reg(hw, M88E1000_PHY_SPEC_STATUS, &phy_data);
	if (ret_val)
		goto out;

	phy->is_mdix = (phy_data & M88E1000_PSSR_MDIX) ? true : false;

	if ((phy_data & M88E1000_PSSR_SPEED) == M88E1000_PSSR_1000MBS) {
		ret_val = hw->phy.ops.get_cable_length(hw);
		if (ret_val)
			goto out;

		ret_val = phy->ops.read_reg(hw, PHY_1000T_STATUS, &phy_data);
		if (ret_val)
			goto out;

		phy->local_rx = (phy_data & SR_1000T_LOCAL_RX_STATUS)
		                ? e1000_1000t_rx_status_ok
		                : e1000_1000t_rx_status_not_ok;

		phy->remote_rx = (phy_data & SR_1000T_REMOTE_RX_STATUS)
		                 ? e1000_1000t_rx_status_ok
		                 : e1000_1000t_rx_status_not_ok;
	} else {
		/* Set values to "undefined" */
		phy->cable_length = E1000_CABLE_LENGTH_UNDEFINED;
		phy->local_rx = e1000_1000t_rx_status_undefined;
		phy->remote_rx = e1000_1000t_rx_status_undefined;
	}

out:
	return ret_val;
}

/**
 *  e1000_get_phy_info_igp - Retrieve igp PHY information
 *  @hw: pointer to the HW structure
 *
 *  Read PHY status to determine if link is up.  If link is up, then
 *  set/determine 10base-T extended distance and polarity correction.  Read
 *  PHY port status to determine MDI/MDIx and speed.  Based on the speed,
 *  determine on the cable length, local and remote receiver.
 **/
s32 e1000_get_phy_info_igp(struct e1000_hw *hw)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32 ret_val;
	u16 data;
	bool link;

	DEBUGFUNC("e1000_get_phy_info_igp");

	ret_val = e1000_phy_has_link_generic(hw, 1, 0, &link);
	if (ret_val)
		goto out;

	if (!link) {
		DEBUGOUT("Phy info is only valid if link is up\n");
		ret_val = -E1000_ERR_CONFIG;
		goto out;
	}

	phy->polarity_correction = true;

	ret_val = e1000_check_polarity_igp(hw);
	if (ret_val)
		goto out;

	ret_val = phy->ops.read_reg(hw, IGP01E1000_PHY_PORT_STATUS, &data);
	if (ret_val)
		goto out;

	phy->is_mdix = (data & IGP01E1000_PSSR_MDIX) ? true : false;

	if ((data & IGP01E1000_PSSR_SPEED_MASK) ==
	    IGP01E1000_PSSR_SPEED_1000MBPS) {
		ret_val = hw->phy.ops.get_cable_length(hw);
		if (ret_val)
			goto out;

		ret_val = phy->ops.read_reg(hw, PHY_1000T_STATUS, &data);
		if (ret_val)
			goto out;

		phy->local_rx = (data & SR_1000T_LOCAL_RX_STATUS)
		                ? e1000_1000t_rx_status_ok
		                : e1000_1000t_rx_status_not_ok;

		phy->remote_rx = (data & SR_1000T_REMOTE_RX_STATUS)
		                 ? e1000_1000t_rx_status_ok
		                 : e1000_1000t_rx_status_not_ok;
	} else {
		phy->cable_length = E1000_CABLE_LENGTH_UNDEFINED;
		phy->local_rx = e1000_1000t_rx_status_undefined;
		phy->remote_rx = e1000_1000t_rx_status_undefined;
	}

out:
	return ret_val;
}

/**
 *  e1000_phy_sw_reset_generic - PHY software reset
 *  @hw: pointer to the HW structure
 *
 *  Does a software reset of the PHY by reading the PHY control register and
 *  setting/write the control register reset bit to the PHY.
 **/
s32 e1000_phy_sw_reset_generic(struct e1000_hw *hw)
{
	s32 ret_val = E1000_SUCCESS;
	u16 phy_ctrl;

	DEBUGFUNC("e1000_phy_sw_reset_generic");

	if (!(hw->phy.ops.read_reg))
		goto out;

	ret_val = hw->phy.ops.read_reg(hw, PHY_CONTROL, &phy_ctrl);
	if (ret_val)
		goto out;

	phy_ctrl |= MII_CR_RESET;
	ret_val = hw->phy.ops.write_reg(hw, PHY_CONTROL, phy_ctrl);
	if (ret_val)
		goto out;

	usec_delay(1);

out:
	return ret_val;
}

/**
 *  e1000_phy_hw_reset_generic - PHY hardware reset
 *  @hw: pointer to the HW structure
 *
 *  Verify the reset block is not blocking us from resetting.  Acquire
 *  semaphore (if necessary) and read/set/write the device control reset
 *  bit in the PHY.  Wait the appropriate delay time for the device to
 *  reset and release the semaphore (if necessary).
 **/
s32 e1000_phy_hw_reset_generic(struct e1000_hw *hw)
{
	struct e1000_phy_info *phy = &hw->phy;
	s32 ret_val = E1000_SUCCESS;
	u32 ctrl;

	DEBUGFUNC("e1000_phy_hw_reset_generic");

	ret_val = phy->ops.check_reset_block(hw);
	if (ret_val) {
		ret_val = E1000_SUCCESS;
		goto out;
	}

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

	ctrl = E1000_READ_REG(hw, E1000_CTRL);
	E1000_WRITE_REG(hw, E1000_CTRL, ctrl | E1000_CTRL_PHY_RST);
	E1000_WRITE_FLUSH(hw);

	usec_delay(phy->reset_delay_us);

	E1000_WRITE_REG(hw, E1000_CTRL, ctrl);
	E1000_WRITE_FLUSH(hw);

	usec_delay(150);