netdev - [PATCH net-next 02/15] mlxsw: reg: Add MTUTC register's fields for supporting PTP in Spectrum-2

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Date:   Sun, 24 Jul 2022 11:03:16 +0300
From:   Ido Schimmel <idosch@...dia.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, petrm@...dia.com, amcohen@...dia.com,
        danieller@...dia.com, richardcochran@...il.com, mlxsw@...dia.com,
        Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 02/15] mlxsw: reg: Add MTUTC register's fields for supporting PTP in Spectrum-2

From: Danielle Ratson <danieller@...dia.com>

The MTUTC register configures the HW UTC counter.

Add the relevant fields and operations to support PTP in Spectrum-2 and
update mlxsw_reg_mtutc_pack() with the new fields for a future use.

Signed-off-by: Danielle Ratson <danieller@...dia.com>
Signed-off-by: Amit Cohen <amcohen@...dia.com>
Reviewed-by: Petr Machata <petrm@...dia.com>
Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 drivers/net/ethernet/mellanox/mlxsw/reg.h     | 31 +++++++++++++++++--
 .../ethernet/mellanox/mlxsw/spectrum_ptp.c    |  4 +--
 2 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/reg.h b/drivers/net/ethernet/mellanox/mlxsw/reg.h
index 0ed2a805ce83..5665a60afc3f 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/reg.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/reg.h
@@ -10347,6 +10347,8 @@ MLXSW_REG_DEFINE(mtutc, MLXSW_REG_MTUTC_ID, MLXSW_REG_MTUTC_LEN);
 
 enum mlxsw_reg_mtutc_operation {
 	MLXSW_REG_MTUTC_OPERATION_SET_TIME_AT_NEXT_SEC = 0,
+	MLXSW_REG_MTUTC_OPERATION_SET_TIME_IMMEDIATE = 1,
+	MLXSW_REG_MTUTC_OPERATION_ADJUST_TIME = 2,
 	MLXSW_REG_MTUTC_OPERATION_ADJUST_FREQ = 3,
 };
 
@@ -10359,25 +10361,50 @@ MLXSW_ITEM32(reg, mtutc, operation, 0x00, 0, 4);
 /* reg_mtutc_freq_adjustment
  * Frequency adjustment: Every PPS the HW frequency will be
  * adjusted by this value. Units of HW clock, where HW counts
- * 10^9 HW clocks for 1 HW second.
+ * 10^9 HW clocks for 1 HW second. Range is from -50,000,000 to +50,000,000.
+ * In Spectrum-2, the field is reversed, positive values mean to decrease the
+ * frequency.
  * Access: RW
  */
 MLXSW_ITEM32(reg, mtutc, freq_adjustment, 0x04, 0, 32);
 
+#define MLXSW_REG_MTUTC_MAX_FREQ_ADJ (50 * 1000 * 1000)
+
 /* reg_mtutc_utc_sec
  * UTC seconds.
  * Access: WO
  */
 MLXSW_ITEM32(reg, mtutc, utc_sec, 0x10, 0, 32);
 
+/* reg_mtutc_utc_nsec
+ * UTC nSecs.
+ * Range 0..(10^9-1)
+ * Updated when operation is SET_TIME_IMMEDIATE.
+ * Reserved on Spectrum-1.
+ * Access: WO
+ */
+MLXSW_ITEM32(reg, mtutc, utc_nsec, 0x14, 0, 30);
+
+/* reg_mtutc_time_adjustment
+ * Time adjustment.
+ * Units of nSec.
+ * Range is from -32768 to +32767.
+ * Updated when operation is ADJUST_TIME.
+ * Reserved on Spectrum-1.
+ * Access: WO
+ */
+MLXSW_ITEM32(reg, mtutc, time_adjustment, 0x18, 0, 32);
+
 static inline void
 mlxsw_reg_mtutc_pack(char *payload, enum mlxsw_reg_mtutc_operation oper,
-		     u32 freq_adj, u32 utc_sec)
+		     u32 freq_adj, u32 utc_sec, u32 utc_nsec, u32 time_adj)
 {
 	MLXSW_REG_ZERO(mtutc, payload);
 	mlxsw_reg_mtutc_operation_set(payload, oper);
 	mlxsw_reg_mtutc_freq_adjustment_set(payload, freq_adj);
 	mlxsw_reg_mtutc_utc_sec_set(payload, utc_sec);
+	mlxsw_reg_mtutc_utc_nsec_set(payload, utc_nsec);
+	mlxsw_reg_mtutc_time_adjustment_set(payload, time_adj);
 }
 
 /* MCQI - Management Component Query Information
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c
index a976c7fbb04a..39586673b395 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c
@@ -107,7 +107,7 @@ mlxsw_sp1_ptp_phc_adjfreq(struct mlxsw_sp_ptp_clock *clock, int freq_adj)
 	char mtutc_pl[MLXSW_REG_MTUTC_LEN];
 
 	mlxsw_reg_mtutc_pack(mtutc_pl, MLXSW_REG_MTUTC_OPERATION_ADJUST_FREQ,
-			     freq_adj, 0);
+			     freq_adj, 0, 0, 0);
 	return mlxsw_reg_write(mlxsw_core, MLXSW_REG(mtutc), mtutc_pl);
 }
 
@@ -144,7 +144,7 @@ mlxsw_sp1_ptp_phc_settime(struct mlxsw_sp_ptp_clock *clock, u64 nsec)
 
 	mlxsw_reg_mtutc_pack(mtutc_pl,
 			     MLXSW_REG_MTUTC_OPERATION_SET_TIME_AT_NEXT_SEC,
-			     0, next_sec);
+			     0, next_sec, 0, 0);
 	return mlxsw_reg_write(mlxsw_core, MLXSW_REG(mtutc), mtutc_pl);
 }
 
-- 
2.36.1