i40e: expose debug_write_register request

Now that the HW registers are no longer in debug mode and many are
locked down for writes, we need to expose the Firmware API request
used to do writes on the driver's behalf.

Change-ID: I09a05c4dc9ea0b24c00193faac34d7799eaa8496
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Tested-by: Jim Young <jamesx.m.young>
Signed-off-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 32 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c
index a010584d8962..df43e7c6777c 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_common.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
@@ -2002,6 +2002,35 @@ i40e_status i40e_aq_send_msg_to_vf(struct i40e_hw *hw, u16 vfid,
 }
 
 /**
+ * i40e_aq_debug_write_register
+ * @hw: pointer to the hw struct
+ * @reg_addr: register address
+ * @reg_val: register value
+ * @cmd_details: pointer to command details structure or NULL
+ *
+ * Write to a register using the admin queue commands
+ **/
+i40e_status i40e_aq_debug_write_register(struct i40e_hw *hw,
+                                        u32 reg_addr, u64 reg_val,
+                                        struct i40e_asq_cmd_details *cmd_details)
+{
+        struct i40e_aq_desc desc;
+        struct i40e_aqc_debug_reg_read_write *cmd =
+                (struct i40e_aqc_debug_reg_read_write *)&desc.params.raw;
+        i40e_status status;
+
+        i40e_fill_default_direct_cmd_desc(&desc, i40e_aqc_opc_debug_write_reg);
+
+        cmd->address = cpu_to_le32(reg_addr);
+        cmd->value_high = cpu_to_le32((u32)(reg_val >> 32));
+        cmd->value_low = cpu_to_le32((u32)(reg_val & 0xFFFFFFFF));
+
+        status = i40e_asq_send_command(hw, &desc, NULL, 0, cmd_details);
+
+        return status;
+}
+
+/**
  * i40e_aq_set_hmc_resource_profile
  * @hw: pointer to the hw struct
  * @profile: type of profile the HMC is to be set as
diff --git a/drivers/net/ethernet/intel/i40e/i40e_prototype.h b/drivers/net/ethernet/intel/i40e/i40e_prototype.h
index 8cd4390a2842..949a9a01778b 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_prototype.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_prototype.h
@@ -70,6 +70,9 @@ i40e_status i40e_aq_get_firmware_version(struct i40e_hw *hw,
                                 u16 *fw_major_version, u16 *fw_minor_version,
                                 u16 *api_major_version, u16 *api_minor_version,
                                 struct i40e_asq_cmd_details *cmd_details);
+i40e_status i40e_aq_debug_write_register(struct i40e_hw *hw,
+                                        u32 reg_addr, u64 reg_val,
+                                        struct i40e_asq_cmd_details *cmd_details);
 i40e_status i40e_aq_set_phy_debug(struct i40e_hw *hw, u8 cmd_flags,
                                 struct i40e_asq_cmd_details *cmd_details);
 i40e_status i40e_aq_set_default_vsi(struct i40e_hw *hw, u16 vsi_id,