wifi: iwlwifi: mvm: implement PHC clock adjustments

Implement the following PHC operations:
1. adjtime - for adding an offset to the PHC clock time.
2. adjfine - for adjusting the PHC clock frequency.
3. gettime64 - for getting the PHC clock time. This function returns
   the time as adjusted by adjtime and adjfine.

The adjusted time will also be used for time sync frames timestamping.

Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230320122330.f59750deeee4.I110a7e3ac3c6d39d9dbe1fe77001e3f5bc3814eb@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 19 insertions, 2 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
index b6b73164357d..2cd86237bc14 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
@@ -775,10 +775,26 @@ struct iwl_mvm_dqa_txq_info {
 struct ptp_data {
 	struct ptp_clock *ptp_clock;
 	struct ptp_clock_info ptp_clock_info;
-	/* keeps track of GP2 wrap-around */
+
+	struct delayed_work dwork;
+
+	/* The last GP2 reading from the hw */
 	u32 last_gp2;
+
+	/* number of wraparounds since scale_update_adj_time_ns */
 	u32 wrap_counter;
-	struct delayed_work dwork;
+
+	/* GP2 time when the scale was last updated */
+	u32 scale_update_gp2;
+
+	/* Adjusted time when the scale was last updated in nanoseconds */
+	u64 scale_update_adj_time_ns;
+
+	/* clock frequency offset, scaled to 65536000000 */
+	u64 scaled_freq;
+
+	/* Delta between hardware clock and ptp clock in nanoseconds */
+	s64 delta;
 };
 
 struct iwl_time_sync_data {
@@ -2144,6 +2160,7 @@ void iwl_mvm_event_frame_timeout_callback(struct iwl_mvm *mvm,
 
 void iwl_mvm_ptp_init(struct iwl_mvm *mvm);
 void iwl_mvm_ptp_remove(struct iwl_mvm *mvm);
+u64 iwl_mvm_ptp_get_adj_time(struct iwl_mvm *mvm, u64 base_time);
 int iwl_mvm_sar_select_profile(struct iwl_mvm *mvm, int prof_a, int prof_b);
 int iwl_mvm_get_sar_geo_profile(struct iwl_mvm *mvm);
 int iwl_mvm_ppag_send_cmd(struct iwl_mvm *mvm);