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net: dsa: mv88e6xxx: expose switch time as a PTP hardware clock

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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>
This commit is contained in:
Brandon Streiff
2018-02-14 01:07:45 +01:00
committed by David S. Miller
parent 0d632c3d6f
commit 2fa8d3af4b
6 changed files with 326 additions and 0 deletions
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15
drivers/net/dsa/mv88e6xxx/chip.h
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@@ -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 {