net: dsa: mv88e6xxx: Add mv88e6165 PTP support

The mv88e6165 family has its global clock in the PTP global
registers. It does not support any form of PTP events. Add a function
to read the clock, fill in an ops structure, and register it with the
two members of the family.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -2811,6 +2811,7 @@ static const struct mv88e6xxx_ops mv88e6161_ops = {
 	.vtu_getnext = mv88e6352_g1_vtu_getnext,
 	.vtu_loadpurge = mv88e6352_g1_vtu_loadpurge,
 	.avb_ops = &mv88e6165_avb_ops,
+	.ptp_ops = &mv88e6165_ptp_ops,
 };
 
 static const struct mv88e6xxx_ops mv88e6165_ops = {
@@ -2840,6 +2841,7 @@ static const struct mv88e6xxx_ops mv88e6165_ops = {
 	.vtu_getnext = mv88e6352_g1_vtu_getnext,
 	.vtu_loadpurge = mv88e6352_g1_vtu_loadpurge,
 	.avb_ops = &mv88e6165_avb_ops,
+	.ptp_ops = &mv88e6165_ptp_ops,
 };
 
 static const struct mv88e6xxx_ops mv88e6171_ops = {
@@ -3693,6 +3695,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.pvt = true,
 		.multi_chip = true,
 		.tag_protocol = DSA_TAG_PROTO_EDSA,
+		.ptp_support = true,
 		.ops = &mv88e6161_ops,
 	},
 
@@ -3715,6 +3718,7 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.pvt = true,
 		.multi_chip = true,
 		.tag_protocol = DSA_TAG_PROTO_DSA,
+		.ptp_support = true,
 		.ops = &mv88e6165_ops,
 	},
 

drivers/net/dsa/mv88e6xxx/ptp.c

@@ -79,6 +79,20 @@ static u64 mv88e6352_ptp_clock_read(const struct cyclecounter *cc)
 		return ((u32)phc_time[1] << 16) | phc_time[0];
 }
 
+static u64 mv88e6165_ptp_clock_read(const struct cyclecounter *cc)
+{
+	struct mv88e6xxx_chip *chip = cc_to_chip(cc);
+	u16 phc_time[2];
+	int err;
+
+	err = mv88e6xxx_tai_read(chip, MV88E6XXX_PTP_GC_TIME_LO, phc_time,
+				 ARRAY_SIZE(phc_time));
+	if (err)
+		return 0;
+	else
+		return ((u32)phc_time[1] << 16) | phc_time[0];
+}
+
 /* mv88e6352_config_eventcap - configure TAI event capture
  * @event: PTP_CLOCK_PPS (internal) or PTP_CLOCK_EXTTS (external)
  * @rising: zero for falling-edge trigger, else rising-edge trigger
@@ -307,6 +321,10 @@ const struct mv88e6xxx_ptp_ops mv88e6352_ptp_ops = {
 	.n_ext_ts = 1,
 };
 
+const struct mv88e6xxx_ptp_ops mv88e6165_ptp_ops = {
+	.clock_read = mv88e6165_ptp_clock_read,
+};
+
 static u64 mv88e6xxx_ptp_clock_read(const struct cyclecounter *cc)
 {
 	struct mv88e6xxx_chip *chip = cc_to_chip(cc);

drivers/net/dsa/mv88e6xxx/ptp.h

@@ -78,6 +78,33 @@
 /* Offset 0x12: Lock Status */
 #define MV88E6XXX_TAI_LOCK_STATUS		0x12
 
+/* Offset 0x00: Ether Type */
+#define MV88E6XXX_PTP_GC_ETYPE			0x00
+
+/* Offset 0x01: Message ID */
+#define MV88E6XXX_PTP_GC_MESSAGE_ID		0x01
+
+/* Offset 0x02: Time Stamp Arrive Time */
+#define MV88E6XXX_PTP_GC_TS_ARR_PTR		0x02
+
+/* Offset 0x03: Port Arrival Interrupt Enable */
+#define MV88E6XXX_PTP_GC_PORT_ARR_INT_EN	0x03
+
+/* Offset 0x04: Port Departure Interrupt Enable */
+#define MV88E6XXX_PTP_GC_PORT_DEP_INT_EN	0x04
+
+/* Offset 0x05: Configuration */
+#define MV88E6XXX_PTP_GC_CONFIG			0x05
+#define MV88E6XXX_PTP_GC_CONFIG_DIS_OVERWRITE	BIT(1)
+#define MV88E6XXX_PTP_GC_CONFIG_DIS_TS		BIT(0)
+
+/* Offset 0x8: Interrupt Status */
+#define MV88E6XXX_PTP_GC_INT_STATUS		0x08
+
+/* Offset 0x9/0xa: Global Time */
+#define MV88E6XXX_PTP_GC_TIME_LO		0x09
+#define MV88E6XXX_PTP_GC_TIME_HI		0x0A
+
 #ifdef CONFIG_NET_DSA_MV88E6XXX_PTP
 
 long mv88e6xxx_hwtstamp_work(struct ptp_clock_info *ptp);
@@ -88,6 +115,7 @@ void mv88e6xxx_ptp_free(struct mv88e6xxx_chip *chip);
 				      ptp_clock_info)
 
 extern const struct mv88e6xxx_ptp_ops mv88e6352_ptp_ops;
+extern const struct mv88e6xxx_ptp_ops mv88e6165_ptp_ops;
 
 #else /* !CONFIG_NET_DSA_MV88E6XXX_PTP */
 
@@ -106,6 +134,7 @@ static inline void mv88e6xxx_ptp_free(struct mv88e6xxx_chip *chip)
 }
 
 static const struct mv88e6xxx_ptp_ops mv88e6352_ptp_ops = {};
+static const struct mv88e6xxx_ptp_ops mv88e6165_ptp_ops = {};
 
 #endif /* CONFIG_NET_DSA_MV88E6XXX_PTP */