415 lines
14 KiB
C
415 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* PTP 1588 clock support
|
|
*
|
|
* Copyright (C) 2010 OMICRON electronics GmbH
|
|
*/
|
|
|
|
#ifndef _PTP_CLOCK_KERNEL_H_
|
|
#define _PTP_CLOCK_KERNEL_H_
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/pps_kernel.h>
|
|
#include <linux/ptp_clock.h>
|
|
#include <linux/timecounter.h>
|
|
#include <linux/skbuff.h>
|
|
|
|
#define PTP_CLOCK_NAME_LEN 32
|
|
/**
|
|
* struct ptp_clock_request - request PTP clock event
|
|
*
|
|
* @type: The type of the request.
|
|
* EXTTS: Configure external trigger timestamping
|
|
* PEROUT: Configure periodic output signal (e.g. PPS)
|
|
* PPS: trigger internal PPS event for input
|
|
* into kernel PPS subsystem
|
|
* @extts: describes configuration for external trigger timestamping.
|
|
* This is only valid when event == PTP_CLK_REQ_EXTTS.
|
|
* @perout: describes configuration for periodic output.
|
|
* This is only valid when event == PTP_CLK_REQ_PEROUT.
|
|
*/
|
|
|
|
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 - describes 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
|
|
*
|
|
* @adjphase: Adjusts the phase offset of the hardware clock.
|
|
* parameter delta: Desired change in nanoseconds.
|
|
*
|
|
* @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.
|
|
*
|
|
* @getcycles64: Reads the current free running cycle counter from the hardware
|
|
* clock.
|
|
* If @getcycles64 and @getcyclesx64 are not supported, then
|
|
* @gettime64 or @gettimex64 will be used as default
|
|
* implementation.
|
|
* parameter ts: Holds the result.
|
|
*
|
|
* @getcyclesx64: Reads the current free running cycle counter from the
|
|
* hardware clock and optionally also the system clock.
|
|
* If @getcycles64 and @getcyclesx64 are not supported, then
|
|
* @gettimex64 will be used as default implementation if
|
|
* available.
|
|
* 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.
|
|
*
|
|
* @getcrosscycles: Reads the current free running cycle counter from the
|
|
* hardware clock and system clock simultaneously.
|
|
* If @getcycles64 and @getcyclesx64 are not supported, then
|
|
* @getcrosststamp will be used as default implementation if
|
|
* available.
|
|
* parameter cts: Contains timestamp (device,system) pair,
|
|
* where system time is realtime and monotonic.
|
|
*
|
|
* @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_aux_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[PTP_CLOCK_NAME_LEN];
|
|
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 (*adjphase)(struct ptp_clock_info *ptp, s32 phase);
|
|
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 (*getcycles64)(struct ptp_clock_info *ptp, struct timespec64 *ts);
|
|
int (*getcyclesx64)(struct ptp_clock_info *ptp, struct timespec64 *ts,
|
|
struct ptp_system_timestamp *sts);
|
|
int (*getcrosscycles)(struct ptp_clock_info *ptp,
|
|
struct system_device_crosststamp *cts);
|
|
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;
|
|
};
|
|
};
|
|
|
|
/**
|
|
* scaled_ppm_to_ppb() - convert scaled ppm to ppb
|
|
*
|
|
* @ppm: Parts per million, but with a 16 bit binary fractional field
|
|
*/
|
|
static inline long scaled_ppm_to_ppb(long ppm)
|
|
{
|
|
/*
|
|
* The 'freq' field in the 'struct timex' is in parts per
|
|
* million, but with a 16 bit binary fractional field.
|
|
*
|
|
* We want to calculate
|
|
*
|
|
* ppb = scaled_ppm * 1000 / 2^16
|
|
*
|
|
* which simplifies to
|
|
*
|
|
* ppb = scaled_ppm * 125 / 2^13
|
|
*/
|
|
s64 ppb = 1 + ppm;
|
|
|
|
ppb *= 125;
|
|
ppb >>= 13;
|
|
return (long)ppb;
|
|
}
|
|
|
|
#if IS_ENABLED(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
|
|
*
|
|
* The caller must hold ptp_clock::pincfg_mux. Drivers do not have
|
|
* access to that mutex as ptp_clock is an opaque type. However, the
|
|
* core code acquires the mutex before invoking the driver's
|
|
* ptp_clock_info::enable() callback, and so drivers may call this
|
|
* function from that context.
|
|
*
|
|
* @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_find_pin_unlocked() - wrapper for ptp_find_pin()
|
|
*
|
|
* This function acquires the ptp_clock::pincfg_mux mutex before
|
|
* invoking ptp_find_pin(). Instead of using this function, drivers
|
|
* should most likely call ptp_find_pin() directly from their
|
|
* ptp_clock_info::enable() method.
|
|
*
|
|
*/
|
|
|
|
int ptp_find_pin_unlocked(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);
|
|
|
|
/**
|
|
* ptp_cancel_worker_sync() - cancel ptp auxiliary clock
|
|
*
|
|
* @ptp: The clock obtained from ptp_clock_register().
|
|
*/
|
|
void ptp_cancel_worker_sync(struct ptp_clock *ptp);
|
|
|
|
#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_find_pin_unlocked(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; }
|
|
static inline void ptp_cancel_worker_sync(struct ptp_clock *ptp)
|
|
{ }
|
|
#endif
|
|
|
|
#if IS_BUILTIN(CONFIG_PTP_1588_CLOCK)
|
|
/*
|
|
* These are called by the network core, and don't work if PTP is in
|
|
* a loadable module.
|
|
*/
|
|
|
|
/**
|
|
* ptp_get_vclocks_index() - get all vclocks index on pclock, and
|
|
* caller is responsible to free memory
|
|
* of vclock_index
|
|
*
|
|
* @pclock_index: phc index of ptp pclock.
|
|
* @vclock_index: pointer to pointer of vclock index.
|
|
*
|
|
* return number of vclocks.
|
|
*/
|
|
int ptp_get_vclocks_index(int pclock_index, int **vclock_index);
|
|
|
|
/**
|
|
* ptp_convert_timestamp() - convert timestamp to a ptp vclock time
|
|
*
|
|
* @hwtstamp: timestamp
|
|
* @vclock_index: phc index of ptp vclock.
|
|
*
|
|
* Returns converted timestamp, or 0 on error.
|
|
*/
|
|
ktime_t ptp_convert_timestamp(const ktime_t *hwtstamp, int vclock_index);
|
|
#else
|
|
static inline int ptp_get_vclocks_index(int pclock_index, int **vclock_index)
|
|
{ return 0; }
|
|
static inline ktime_t ptp_convert_timestamp(const ktime_t *hwtstamp,
|
|
int vclock_index)
|
|
{ return 0; }
|
|
|
|
#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
|