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ptp: add kernel API ptp_convert_timestamp()

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Add kernel API ptp_convert_timestamp() to convert raw hardware timestamp
to a specified ptp vclock time.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yangbo Lu 2021-06-30 16:11:57 +08:00 committed by David S. Miller
parent c156174a67
commit 895487a3a1
2 changed files with 47 additions and 0 deletions
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34
drivers/ptp/ptp_vclock.c
View File

@ -183,3 +183,37 @@ out:
return num;
}
EXPORT_SYMBOL(ptp_get_vclocks_index);
void ptp_convert_timestamp(struct skb_shared_hwtstamps *hwtstamps,
int vclock_index)
{
char name[PTP_CLOCK_NAME_LEN] = "";
struct ptp_vclock *vclock;
struct ptp_clock *ptp;
unsigned long flags;
struct device *dev;
u64 ns;
snprintf(name, PTP_CLOCK_NAME_LEN, "ptp%d", vclock_index);
dev = class_find_device_by_name(ptp_class, name);
if (!dev)
return;
ptp = dev_get_drvdata(dev);
if (!ptp->is_virtual_clock) {
put_device(dev);
return;
}
vclock = info_to_vclock(ptp->info);
ns = ktime_to_ns(hwtstamps->hwtstamp);
spin_lock_irqsave(&vclock->lock, flags);
ns = timecounter_cyc2time(&vclock->tc, ns);
spin_unlock_irqrestore(&vclock->lock, flags);
put_device(dev);
hwtstamps->hwtstamp = ns_to_ktime(ns);
}
EXPORT_SYMBOL(ptp_convert_timestamp);

13
include/linux/ptp_clock_kernel.h
View File

@ -12,6 +12,7 @@
#include <linux/pps_kernel.h>
#include <linux/ptp_clock.h>
#include <linux/timecounter.h>
#include <linux/skbuff.h>
#define PTP_CLOCK_NAME_LEN 32
/**
@ -318,6 +319,15 @@ void ptp_cancel_worker_sync(struct ptp_clock *ptp);
*/
int ptp_get_vclocks_index(int pclock_index, int **vclock_index);
/**
* ptp_convert_timestamp() - convert timestamp to a ptp vclock time
*
* @hwtstamps: skb_shared_hwtstamps structure pointer
* @vclock_index: phc index of ptp vclock.
*/
void ptp_convert_timestamp(struct skb_shared_hwtstamps *hwtstamps,
int vclock_index);
#else
static inline struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
struct device *parent)
@ -339,6 +349,9 @@ static inline void ptp_cancel_worker_sync(struct ptp_clock *ptp)
{ }
static inline int ptp_get_vclocks_index(int pclock_index, int **vclock_index)
{ return 0; }
static inline void ptp_convert_timestamp(struct skb_shared_hwtstamps *hwtstamps,
int vclock_index)
{ }
#endif