ixgbe: Add function ixgbe_reset_pipeline_82599

This patch adds a function that forces a full pipeline reset.  This
function will be used in following patches to completely reset the PHY
during resets.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
index 1077cb2..b527813 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
@@ -2080,6 +2080,50 @@ static s32 ixgbe_read_eeprom_82599(struct ixgbe_hw *hw,
        return ret_val;
 }
 
+/**
+ * ixgbe_reset_pipeline_82599 - perform pipeline reset
+ *
+ * @hw: pointer to hardware structure
+ *
+ * Reset pipeline by asserting Restart_AN together with LMS change to ensure
+ * full pipeline reset.  Note - We must hold the SW/FW semaphore before writing
+ * to AUTOC, so this function assumes the semaphore is held.
+ **/
+s32 ixgbe_reset_pipeline_82599(struct ixgbe_hw *hw)
+{
+       s32 i, autoc_reg, ret_val;
+       s32 anlp1_reg = 0;
+
+       autoc_reg = IXGBE_READ_REG(hw, IXGBE_AUTOC);
+       autoc_reg |= IXGBE_AUTOC_AN_RESTART;
+
+       /* Write AUTOC register with toggled LMS[2] bit and Restart_AN */
+       IXGBE_WRITE_REG(hw, IXGBE_AUTOC, autoc_reg ^ IXGBE_AUTOC_LMS_1G_AN);
+
+       /* Wait for AN to leave state 0 */
+       for (i = 0; i < 10; i++) {
+               usleep_range(4000, 8000);
+               anlp1_reg = IXGBE_READ_REG(hw, IXGBE_ANLP1);
+               if (anlp1_reg & IXGBE_ANLP1_AN_STATE_MASK)
+                       break;
+       }
+
+       if (!(anlp1_reg & IXGBE_ANLP1_AN_STATE_MASK)) {
+               hw_dbg(hw, "auto negotiation not completed\n");
+               ret_val = IXGBE_ERR_RESET_FAILED;
+               goto reset_pipeline_out;
+       }
+
+       ret_val = 0;
+
+reset_pipeline_out:
+       /* Write AUTOC register with original LMS field and Restart_AN */
+       IXGBE_WRITE_REG(hw, IXGBE_AUTOC, autoc_reg);
+       IXGBE_WRITE_FLUSH(hw);
+
+       return ret_val;
+}
+
 static struct ixgbe_mac_operations mac_ops_82599 = {
        .init_hw                = &ixgbe_init_hw_generic,
        .reset_hw               = &ixgbe_reset_hw_82599,

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.h
index d813d11..587db47 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.h
@@ -107,6 +107,7 @@ void ixgbe_clear_tx_pending(struct ixgbe_hw *hw);
 
 void ixgbe_set_rxpba_generic(struct ixgbe_hw *hw, int num_pb,
                             u32 headroom, int strategy);
+s32 ixgbe_reset_pipeline_82599(struct ixgbe_hw *hw);
 
 #define IXGBE_I2C_THERMAL_SENSOR_ADDR  0xF8
 #define IXGBE_EMC_INTERNAL_DATA                0x00