net: dsa: mv88e6xxx: expose switch time as a PTP hardware clock
This patch adds basic support for exposing the 32-bit timestamp counter
inside the mv88e6xxx switch as a ptp_clock.
Adjfine implemented by Richard Cochran.
Andrew Lunn: fix return value of PTP stub function.
Signed-off-by: Brandon Streiff <brandon.streiff@ni.com>
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
index 5467c86..92e5fd6 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.h
+++ b/drivers/net/dsa/mv88e6xxx/chip.h
@@ -16,6 +16,8 @@
#include <linux/irq.h>
#include <linux/gpio/consumer.h>
#include <linux/phy.h>
+#include <linux/ptp_clock_kernel.h>
+#include <linux/timecounter.h>
#include <net/dsa.h>
#ifndef UINT64_MAX
@@ -126,6 +128,9 @@ struct mv88e6xxx_info {
*/
u8 atu_move_port_mask;
const struct mv88e6xxx_ops *ops;
+
+ /* Supports PTP */
+ bool ptp_support;
};
struct mv88e6xxx_atu_entry {
@@ -210,6 +215,16 @@ struct mv88e6xxx_chip {
int watchdog_irq;
int atu_prob_irq;
int vtu_prob_irq;
+
+ /* This cyclecounter abstracts the switch PTP time.
+ * reg_lock must be held for any operation that read()s.
+ */
+ struct cyclecounter tstamp_cc;
+ struct timecounter tstamp_tc;
+ struct delayed_work overflow_work;
+
+ struct ptp_clock *ptp_clock;
+ struct ptp_clock_info ptp_clock_info;
};
struct mv88e6xxx_bus_ops {
