igb: Enable EEE LP advertisement

On EEE-capable devices, query the PHY to determine what the link partner is
advertising.

Signed-off-by: Matthew Vick <matthew.vick@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/igb/e1000_i210.c b/drivers/net/ethernet/intel/igb/e1000_i210.c
index 7df442a3cdfd..9764cd3610e5 100644
--- a/drivers/net/ethernet/intel/igb/e1000_i210.c
+++ b/drivers/net/ethernet/intel/igb/e1000_i210.c
@@ -708,3 +708,68 @@ s32 igb_valid_led_default_i210(struct e1000_hw *hw, u16 *data)
 out:
 	return ret_val;
 }
+
+/**
+ *  __igb_access_xmdio_reg - Read/write XMDIO register
+ *  @hw: pointer to the HW structure
+ *  @address: XMDIO address to program
+ *  @dev_addr: device address to program
+ *  @data: pointer to value to read/write from/to the XMDIO address
+ *  @read: boolean flag to indicate read or write
+ **/
+static s32 __igb_access_xmdio_reg(struct e1000_hw *hw, u16 address,
+				  u8 dev_addr, u16 *data, bool read)
+{
+	s32 ret_val = E1000_SUCCESS;
+
+	ret_val = hw->phy.ops.write_reg(hw, E1000_MMDAC, dev_addr);
+	if (ret_val)
+		return ret_val;
+
+	ret_val = hw->phy.ops.write_reg(hw, E1000_MMDAAD, address);
+	if (ret_val)
+		return ret_val;
+
+	ret_val = hw->phy.ops.write_reg(hw, E1000_MMDAC, E1000_MMDAC_FUNC_DATA |
+							 dev_addr);
+	if (ret_val)
+		return ret_val;
+
+	if (read)
+		ret_val = hw->phy.ops.read_reg(hw, E1000_MMDAAD, data);
+	else
+		ret_val = hw->phy.ops.write_reg(hw, E1000_MMDAAD, *data);
+	if (ret_val)
+		return ret_val;
+
+	/* Recalibrate the device back to 0 */
+	ret_val = hw->phy.ops.write_reg(hw, E1000_MMDAC, 0);
+	if (ret_val)
+		return ret_val;
+
+	return ret_val;
+}
+
+/**
+ *  igb_read_xmdio_reg - Read XMDIO register
+ *  @hw: pointer to the HW structure
+ *  @addr: XMDIO address to program
+ *  @dev_addr: device address to program
+ *  @data: value to be read from the EMI address
+ **/
+s32 igb_read_xmdio_reg(struct e1000_hw *hw, u16 addr, u8 dev_addr, u16 *data)
+{
+	return __igb_access_xmdio_reg(hw, addr, dev_addr, data, true);
+}
+
+/**
+ *  igb_write_xmdio_reg - Write XMDIO register
+ *  @hw: pointer to the HW structure
+ *  @addr: XMDIO address to program
+ *  @dev_addr: device address to program
+ *  @data: value to be written to the XMDIO address
+ **/
+s32 igb_write_xmdio_reg(struct e1000_hw *hw, u16 addr, u8 dev_addr, u16 data)
+{
+	return __igb_access_xmdio_reg(hw, addr, dev_addr, &data, false);
+}