ice: implement basic E822 PTP support

Implement support for the basic operations needed to enable the PTP
hardware clock on E822 devices.

This includes implementations for the various PHY access functions, as
well as the ability to start and stop the PHY timers. This is different
from the E810 device because the configuration depends on link speed, so
we cannot just start the PHYs immediately. We must wait until the link
is up to get proper values for the speed based initialization.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 22 insertions, 4 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
index e7411d5003d7..a110c81d4772 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -82,6 +82,8 @@ struct ice_tx_tstamp {
  * @quad_offset: offset into timestamp block of the quad to get the real index
  * @len: length of the tstamps and in_use fields.
  * @init: if true, the tracker is initialized;
+ * @calibrating: if true, the PHY is calibrating the Tx offset. During this
+ *               window, timestamps are temporarily disabled.
  */
 struct ice_ptp_tx {
 	struct kthread_work work;
@@ -92,6 +94,7 @@ struct ice_ptp_tx {
 	u8 quad_offset;
 	u8 len;
 	u8 init;
+	u8 calibrating;
 };
 
 /* Quad and port information for initializing timestamp blocks */
@@ -101,15 +104,20 @@ struct ice_ptp_tx {
 /**
  * struct ice_ptp_port - data used to initialize an external port for PTP
  *
- * This structure contains PTP data related to the external ports. Currently
- * it is used for tracking the Tx timestamps of a port. In the future this
- * structure will also hold information for the E822 port initialization
- * logic.
+ * This structure contains data indicating whether a single external port is
+ * ready for PTP functionality. It is used to track the port initialization
+ * and determine when the port's PHY offset is valid.
  *
  * @tx: Tx timestamp tracking for this port
+ * @ps_lock: mutex used to protect the overall PTP PHY start procedure
+ * @link_up: indicates whether the link is up
+ * @port_num: the port number this structure represents
  */
 struct ice_ptp_port {
 	struct ice_ptp_tx tx;
+	struct mutex ps_lock; /* protects overall PTP PHY start procedure */
+	bool link_up;
+	u8 port_num;
 };
 
 #define GLTSYN_TGT_H_IDX_MAX		4
@@ -154,9 +162,15 @@ struct ice_ptp {
 #define ptp_info_to_pf(i) \
 	container_of(__ptp_info_to_ptp((i)), struct ice_pf, ptp)
 
+#define PFTSYN_SEM_BYTES		4
 #define PTP_SHARED_CLK_IDX_VALID	BIT(31)
+#define TS_CMD_MASK			0xF
+#define SYNC_EXEC_CMD			0x3
 #define ICE_PTP_TS_VALID		BIT(0)
 
+#define FIFO_EMPTY			BIT(2)
+#define FIFO_OK				0xFF
+#define ICE_PTP_FIFO_NUM_CHECKS		5
 /* Per-channel register definitions */
 #define GLTSYN_AUX_OUT(_chan, _idx)	(GLTSYN_AUX_OUT_0(_idx) + ((_chan) * 8))
 #define GLTSYN_AUX_IN(_chan, _idx)	(GLTSYN_AUX_IN_0(_idx) + ((_chan) * 8))
@@ -177,6 +191,7 @@ struct ice_ptp {
 #define N_PER_OUT_E810T			3
 #define N_PER_OUT_E810T_NO_SMA		2
 #define N_EXT_TS_E810_NO_SMA		2
+#define ETH_GLTSYN_ENA(_i)		(0x03000348 + ((_i) * 4))
 
 #if IS_ENABLED(CONFIG_PTP_1588_CLOCK)
 struct ice_pf;
@@ -195,6 +210,7 @@ void ice_ptp_reset(struct ice_pf *pf);
 void ice_ptp_prepare_for_reset(struct ice_pf *pf);
 void ice_ptp_init(struct ice_pf *pf);
 void ice_ptp_release(struct ice_pf *pf);
+int ice_ptp_link_change(struct ice_pf *pf, u8 port, bool linkup);
 #else /* IS_ENABLED(CONFIG_PTP_1588_CLOCK) */
 static inline int ice_ptp_set_ts_config(struct ice_pf *pf, struct ifreq *ifr)
 {
@@ -226,5 +242,7 @@ static inline void ice_ptp_reset(struct ice_pf *pf) { }
 static inline void ice_ptp_prepare_for_reset(struct ice_pf *pf) { }
 static inline void ice_ptp_init(struct ice_pf *pf) { }
 static inline void ice_ptp_release(struct ice_pf *pf) { }
+static inline int ice_ptp_link_change(struct ice_pf *pf, u8 port, bool linkup)
+{ return 0; }
 #endif /* IS_ENABLED(CONFIG_PTP_1588_CLOCK) */
 #endif /* _ICE_PTP_H_ */