284 lines
9.5 KiB
C
284 lines
9.5 KiB
C
/*
|
|
* PTP 1588 clock support
|
|
*
|
|
* Copyright (C) 2010 OMICRON electronics GmbH
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#ifndef _PTP_CLOCK_KERNEL_H_
|
|
#define _PTP_CLOCK_KERNEL_H_
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/pps_kernel.h>
|
|
#include <linux/ptp_clock.h>
|
|
|
|
|
|
struct ptp_clock_request {
|
|
enum {
|
|
PTP_CLK_REQ_EXTTS,
|
|
PTP_CLK_REQ_PEROUT,
|
|
PTP_CLK_REQ_PPS,
|
|
} type;
|
|
union {
|
|
struct ptp_extts_request extts;
|
|
struct ptp_perout_request perout;
|
|
};
|
|
};
|
|
|
|
struct system_device_crosststamp;
|
|
|
|
/**
|
|
* struct ptp_system_timestamp - system time corresponding to a PHC timestamp
|
|
*/
|
|
struct ptp_system_timestamp {
|
|
struct timespec64 pre_ts;
|
|
struct timespec64 post_ts;
|
|
};
|
|
|
|
/**
|
|
* struct ptp_clock_info - decribes a PTP hardware clock
|
|
*
|
|
* @owner: The clock driver should set to THIS_MODULE.
|
|
* @name: A short "friendly name" to identify the clock and to
|
|
* help distinguish PHY based devices from MAC based ones.
|
|
* The string is not meant to be a unique id.
|
|
* @max_adj: The maximum possible frequency adjustment, in parts per billon.
|
|
* @n_alarm: The number of programmable alarms.
|
|
* @n_ext_ts: The number of external time stamp channels.
|
|
* @n_per_out: The number of programmable periodic signals.
|
|
* @n_pins: The number of programmable pins.
|
|
* @pps: Indicates whether the clock supports a PPS callback.
|
|
* @pin_config: Array of length 'n_pins'. If the number of
|
|
* programmable pins is nonzero, then drivers must
|
|
* allocate and initialize this array.
|
|
*
|
|
* clock operations
|
|
*
|
|
* @adjfine: Adjusts the frequency of the hardware clock.
|
|
* parameter scaled_ppm: Desired frequency offset from
|
|
* nominal frequency in parts per million, but with a
|
|
* 16 bit binary fractional field.
|
|
*
|
|
* @adjfreq: Adjusts the frequency of the hardware clock.
|
|
* This method is deprecated. New drivers should implement
|
|
* the @adjfine method instead.
|
|
* parameter delta: Desired frequency offset from nominal frequency
|
|
* in parts per billion
|
|
*
|
|
* @adjtime: Shifts the time of the hardware clock.
|
|
* parameter delta: Desired change in nanoseconds.
|
|
*
|
|
* @gettime64: Reads the current time from the hardware clock.
|
|
* This method is deprecated. New drivers should implement
|
|
* the @gettimex64 method instead.
|
|
* parameter ts: Holds the result.
|
|
*
|
|
* @gettimex64: Reads the current time from the hardware clock and optionally
|
|
* also the system clock.
|
|
* parameter ts: Holds the PHC timestamp.
|
|
* parameter sts: If not NULL, it holds a pair of timestamps from
|
|
* the system clock. The first reading is made right before
|
|
* reading the lowest bits of the PHC timestamp and the second
|
|
* reading immediately follows that.
|
|
*
|
|
* @getcrosststamp: Reads the current time from the hardware clock and
|
|
* system clock simultaneously.
|
|
* parameter cts: Contains timestamp (device,system) pair,
|
|
* where system time is realtime and monotonic.
|
|
*
|
|
* @settime64: Set the current time on the hardware clock.
|
|
* parameter ts: Time value to set.
|
|
*
|
|
* @enable: Request driver to enable or disable an ancillary feature.
|
|
* parameter request: Desired resource to enable or disable.
|
|
* parameter on: Caller passes one to enable or zero to disable.
|
|
*
|
|
* @verify: Confirm that a pin can perform a given function. The PTP
|
|
* Hardware Clock subsystem maintains the 'pin_config'
|
|
* array on behalf of the drivers, but the PHC subsystem
|
|
* assumes that every pin can perform every function. This
|
|
* hook gives drivers a way of telling the core about
|
|
* limitations on specific pins. This function must return
|
|
* zero if the function can be assigned to this pin, and
|
|
* nonzero otherwise.
|
|
* parameter pin: index of the pin in question.
|
|
* parameter func: the desired function to use.
|
|
* parameter chan: the function channel index to use.
|
|
*
|
|
* @do_work: Request driver to perform auxiliary (periodic) operations
|
|
* Driver should return delay of the next auxiliary work scheduling
|
|
* time (>=0) or negative value in case further scheduling
|
|
* is not required.
|
|
*
|
|
* Drivers should embed their ptp_clock_info within a private
|
|
* structure, obtaining a reference to it using container_of().
|
|
*
|
|
* The callbacks must all return zero on success, non-zero otherwise.
|
|
*/
|
|
|
|
struct ptp_clock_info {
|
|
struct module *owner;
|
|
char name[16];
|
|
s32 max_adj;
|
|
int n_alarm;
|
|
int n_ext_ts;
|
|
int n_per_out;
|
|
int n_pins;
|
|
int pps;
|
|
struct ptp_pin_desc *pin_config;
|
|
int (*adjfine)(struct ptp_clock_info *ptp, long scaled_ppm);
|
|
int (*adjfreq)(struct ptp_clock_info *ptp, s32 delta);
|
|
int (*adjtime)(struct ptp_clock_info *ptp, s64 delta);
|
|
int (*gettime64)(struct ptp_clock_info *ptp, struct timespec64 *ts);
|
|
int (*gettimex64)(struct ptp_clock_info *ptp, struct timespec64 *ts,
|
|
struct ptp_system_timestamp *sts);
|
|
int (*getcrosststamp)(struct ptp_clock_info *ptp,
|
|
struct system_device_crosststamp *cts);
|
|
int (*settime64)(struct ptp_clock_info *p, const struct timespec64 *ts);
|
|
int (*enable)(struct ptp_clock_info *ptp,
|
|
struct ptp_clock_request *request, int on);
|
|
int (*verify)(struct ptp_clock_info *ptp, unsigned int pin,
|
|
enum ptp_pin_function func, unsigned int chan);
|
|
long (*do_aux_work)(struct ptp_clock_info *ptp);
|
|
};
|
|
|
|
struct ptp_clock;
|
|
|
|
enum ptp_clock_events {
|
|
PTP_CLOCK_ALARM,
|
|
PTP_CLOCK_EXTTS,
|
|
PTP_CLOCK_PPS,
|
|
PTP_CLOCK_PPSUSR,
|
|
};
|
|
|
|
/**
|
|
* struct ptp_clock_event - decribes a PTP hardware clock event
|
|
*
|
|
* @type: One of the ptp_clock_events enumeration values.
|
|
* @index: Identifies the source of the event.
|
|
* @timestamp: When the event occurred (%PTP_CLOCK_EXTTS only).
|
|
* @pps_times: When the event occurred (%PTP_CLOCK_PPSUSR only).
|
|
*/
|
|
|
|
struct ptp_clock_event {
|
|
int type;
|
|
int index;
|
|
union {
|
|
u64 timestamp;
|
|
struct pps_event_time pps_times;
|
|
};
|
|
};
|
|
|
|
#if IS_REACHABLE(CONFIG_PTP_1588_CLOCK)
|
|
|
|
/**
|
|
* ptp_clock_register() - register a PTP hardware clock driver
|
|
*
|
|
* @info: Structure describing the new clock.
|
|
* @parent: Pointer to the parent device of the new clock.
|
|
*
|
|
* Returns a valid pointer on success or PTR_ERR on failure. If PHC
|
|
* support is missing at the configuration level, this function
|
|
* returns NULL, and drivers are expected to gracefully handle that
|
|
* case separately.
|
|
*/
|
|
|
|
extern struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
|
|
struct device *parent);
|
|
|
|
/**
|
|
* ptp_clock_unregister() - unregister a PTP hardware clock driver
|
|
*
|
|
* @ptp: The clock to remove from service.
|
|
*/
|
|
|
|
extern int ptp_clock_unregister(struct ptp_clock *ptp);
|
|
|
|
/**
|
|
* ptp_clock_event() - notify the PTP layer about an event
|
|
*
|
|
* @ptp: The clock obtained from ptp_clock_register().
|
|
* @event: Message structure describing the event.
|
|
*/
|
|
|
|
extern void ptp_clock_event(struct ptp_clock *ptp,
|
|
struct ptp_clock_event *event);
|
|
|
|
/**
|
|
* ptp_clock_index() - obtain the device index of a PTP clock
|
|
*
|
|
* @ptp: The clock obtained from ptp_clock_register().
|
|
*/
|
|
|
|
extern int ptp_clock_index(struct ptp_clock *ptp);
|
|
|
|
/**
|
|
* ptp_find_pin() - obtain the pin index of a given auxiliary function
|
|
*
|
|
* @ptp: The clock obtained from ptp_clock_register().
|
|
* @func: One of the ptp_pin_function enumerated values.
|
|
* @chan: The particular functional channel to find.
|
|
* Return: Pin index in the range of zero to ptp_clock_caps.n_pins - 1,
|
|
* or -1 if the auxiliary function cannot be found.
|
|
*/
|
|
|
|
int ptp_find_pin(struct ptp_clock *ptp,
|
|
enum ptp_pin_function func, unsigned int chan);
|
|
|
|
/**
|
|
* ptp_schedule_worker() - schedule ptp auxiliary work
|
|
*
|
|
* @ptp: The clock obtained from ptp_clock_register().
|
|
* @delay: number of jiffies to wait before queuing
|
|
* See kthread_queue_delayed_work() for more info.
|
|
*/
|
|
|
|
int ptp_schedule_worker(struct ptp_clock *ptp, unsigned long delay);
|
|
|
|
#else
|
|
static inline struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
|
|
struct device *parent)
|
|
{ return NULL; }
|
|
static inline int ptp_clock_unregister(struct ptp_clock *ptp)
|
|
{ return 0; }
|
|
static inline void ptp_clock_event(struct ptp_clock *ptp,
|
|
struct ptp_clock_event *event)
|
|
{ }
|
|
static inline int ptp_clock_index(struct ptp_clock *ptp)
|
|
{ return -1; }
|
|
static inline int ptp_find_pin(struct ptp_clock *ptp,
|
|
enum ptp_pin_function func, unsigned int chan)
|
|
{ return -1; }
|
|
static inline int ptp_schedule_worker(struct ptp_clock *ptp,
|
|
unsigned long delay)
|
|
{ return -EOPNOTSUPP; }
|
|
|
|
#endif
|
|
|
|
static inline void ptp_read_system_prets(struct ptp_system_timestamp *sts)
|
|
{
|
|
if (sts)
|
|
ktime_get_real_ts64(&sts->pre_ts);
|
|
}
|
|
|
|
static inline void ptp_read_system_postts(struct ptp_system_timestamp *sts)
|
|
{
|
|
if (sts)
|
|
ktime_get_real_ts64(&sts->post_ts);
|
|
}
|
|
|
|
#endif
|