342 lines
11 KiB
C
342 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* PTP 1588 clock support
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*
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* Copyright (C) 2010 OMICRON electronics GmbH
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*/
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#ifndef _PTP_CLOCK_KERNEL_H_
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#define _PTP_CLOCK_KERNEL_H_
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#include <linux/device.h>
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#include <linux/pps_kernel.h>
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#include <linux/ptp_clock.h>
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/**
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* struct ptp_clock_request - request PTP clock event
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*
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* @type: The type of the request.
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* EXTTS: Configure external trigger timestamping
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* PEROUT: Configure periodic output signal (e.g. PPS)
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* PPS: trigger internal PPS event for input
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* into kernel PPS subsystem
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* @extts: describes configuration for external trigger timestamping.
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* This is only valid when event == PTP_CLK_REQ_EXTTS.
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* @perout: describes configuration for periodic output.
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* This is only valid when event == PTP_CLK_REQ_PEROUT.
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*/
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struct ptp_clock_request {
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enum {
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PTP_CLK_REQ_EXTTS,
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PTP_CLK_REQ_PEROUT,
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PTP_CLK_REQ_PPS,
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} type;
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union {
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struct ptp_extts_request extts;
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struct ptp_perout_request perout;
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};
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};
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struct system_device_crosststamp;
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/**
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* struct ptp_system_timestamp - system time corresponding to a PHC timestamp
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*/
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struct ptp_system_timestamp {
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struct timespec64 pre_ts;
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struct timespec64 post_ts;
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};
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/**
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* struct ptp_clock_info - describes a PTP hardware clock
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*
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* @owner: The clock driver should set to THIS_MODULE.
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* @name: A short "friendly name" to identify the clock and to
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* help distinguish PHY based devices from MAC based ones.
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* The string is not meant to be a unique id.
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* @max_adj: The maximum possible frequency adjustment, in parts per billon.
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* @n_alarm: The number of programmable alarms.
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* @n_ext_ts: The number of external time stamp channels.
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* @n_per_out: The number of programmable periodic signals.
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* @n_pins: The number of programmable pins.
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* @pps: Indicates whether the clock supports a PPS callback.
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* @pin_config: Array of length 'n_pins'. If the number of
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* programmable pins is nonzero, then drivers must
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* allocate and initialize this array.
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*
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* clock operations
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*
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* @adjfine: Adjusts the frequency of the hardware clock.
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* parameter scaled_ppm: Desired frequency offset from
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* nominal frequency in parts per million, but with a
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* 16 bit binary fractional field.
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*
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* @adjfreq: Adjusts the frequency of the hardware clock.
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* This method is deprecated. New drivers should implement
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* the @adjfine method instead.
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* parameter delta: Desired frequency offset from nominal frequency
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* in parts per billion
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*
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* @adjphase: Adjusts the phase offset of the hardware clock.
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* parameter delta: Desired change in nanoseconds.
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*
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* @adjtime: Shifts the time of the hardware clock.
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* parameter delta: Desired change in nanoseconds.
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*
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* @gettime64: Reads the current time from the hardware clock.
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* This method is deprecated. New drivers should implement
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* the @gettimex64 method instead.
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* parameter ts: Holds the result.
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*
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* @gettimex64: Reads the current time from the hardware clock and optionally
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* also the system clock.
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* parameter ts: Holds the PHC timestamp.
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* parameter sts: If not NULL, it holds a pair of timestamps from
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* the system clock. The first reading is made right before
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* reading the lowest bits of the PHC timestamp and the second
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* reading immediately follows that.
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*
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* @getcrosststamp: Reads the current time from the hardware clock and
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* system clock simultaneously.
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* parameter cts: Contains timestamp (device,system) pair,
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* where system time is realtime and monotonic.
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*
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* @settime64: Set the current time on the hardware clock.
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* parameter ts: Time value to set.
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*
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* @enable: Request driver to enable or disable an ancillary feature.
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* parameter request: Desired resource to enable or disable.
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* parameter on: Caller passes one to enable or zero to disable.
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*
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* @verify: Confirm that a pin can perform a given function. The PTP
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* Hardware Clock subsystem maintains the 'pin_config'
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* array on behalf of the drivers, but the PHC subsystem
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* assumes that every pin can perform every function. This
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* hook gives drivers a way of telling the core about
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* limitations on specific pins. This function must return
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* zero if the function can be assigned to this pin, and
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* nonzero otherwise.
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* parameter pin: index of the pin in question.
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* parameter func: the desired function to use.
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* parameter chan: the function channel index to use.
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*
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* @do_aux_work: Request driver to perform auxiliary (periodic) operations
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* Driver should return delay of the next auxiliary work
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* scheduling time (>=0) or negative value in case further
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* scheduling is not required.
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*
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* Drivers should embed their ptp_clock_info within a private
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* structure, obtaining a reference to it using container_of().
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*
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* The callbacks must all return zero on success, non-zero otherwise.
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*/
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struct ptp_clock_info {
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struct module *owner;
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char name[16];
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s32 max_adj;
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int n_alarm;
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int n_ext_ts;
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int n_per_out;
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int n_pins;
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int pps;
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struct ptp_pin_desc *pin_config;
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int (*adjfine)(struct ptp_clock_info *ptp, long scaled_ppm);
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int (*adjfreq)(struct ptp_clock_info *ptp, s32 delta);
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int (*adjphase)(struct ptp_clock_info *ptp, s32 phase);
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int (*adjtime)(struct ptp_clock_info *ptp, s64 delta);
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int (*gettime64)(struct ptp_clock_info *ptp, struct timespec64 *ts);
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int (*gettimex64)(struct ptp_clock_info *ptp, struct timespec64 *ts,
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struct ptp_system_timestamp *sts);
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int (*getcrosststamp)(struct ptp_clock_info *ptp,
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struct system_device_crosststamp *cts);
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int (*settime64)(struct ptp_clock_info *p, const struct timespec64 *ts);
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int (*enable)(struct ptp_clock_info *ptp,
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struct ptp_clock_request *request, int on);
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int (*verify)(struct ptp_clock_info *ptp, unsigned int pin,
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enum ptp_pin_function func, unsigned int chan);
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long (*do_aux_work)(struct ptp_clock_info *ptp);
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};
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struct ptp_clock;
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enum ptp_clock_events {
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PTP_CLOCK_ALARM,
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PTP_CLOCK_EXTTS,
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PTP_CLOCK_PPS,
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PTP_CLOCK_PPSUSR,
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};
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/**
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* struct ptp_clock_event - decribes a PTP hardware clock event
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*
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* @type: One of the ptp_clock_events enumeration values.
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* @index: Identifies the source of the event.
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* @timestamp: When the event occurred (%PTP_CLOCK_EXTTS only).
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* @pps_times: When the event occurred (%PTP_CLOCK_PPSUSR only).
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*/
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struct ptp_clock_event {
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int type;
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int index;
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union {
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u64 timestamp;
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struct pps_event_time pps_times;
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};
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};
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/**
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* scaled_ppm_to_ppb() - convert scaled ppm to ppb
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*
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* @ppm: Parts per million, but with a 16 bit binary fractional field
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*/
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static inline long scaled_ppm_to_ppb(long ppm)
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{
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/*
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* The 'freq' field in the 'struct timex' is in parts per
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* million, but with a 16 bit binary fractional field.
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*
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* We want to calculate
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*
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* ppb = scaled_ppm * 1000 / 2^16
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*
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* which simplifies to
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*
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* ppb = scaled_ppm * 125 / 2^13
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*/
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s64 ppb = 1 + ppm;
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ppb *= 125;
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ppb >>= 13;
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return (long)ppb;
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}
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#if IS_REACHABLE(CONFIG_PTP_1588_CLOCK)
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/**
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* ptp_clock_register() - register a PTP hardware clock driver
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*
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* @info: Structure describing the new clock.
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* @parent: Pointer to the parent device of the new clock.
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*
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* Returns a valid pointer on success or PTR_ERR on failure. If PHC
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* support is missing at the configuration level, this function
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* returns NULL, and drivers are expected to gracefully handle that
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* case separately.
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*/
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extern struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
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struct device *parent);
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/**
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* ptp_clock_unregister() - unregister a PTP hardware clock driver
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*
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* @ptp: The clock to remove from service.
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*/
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extern int ptp_clock_unregister(struct ptp_clock *ptp);
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/**
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* ptp_clock_event() - notify the PTP layer about an event
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*
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* @ptp: The clock obtained from ptp_clock_register().
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* @event: Message structure describing the event.
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*/
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extern void ptp_clock_event(struct ptp_clock *ptp,
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struct ptp_clock_event *event);
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/**
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* ptp_clock_index() - obtain the device index of a PTP clock
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*
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* @ptp: The clock obtained from ptp_clock_register().
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*/
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extern int ptp_clock_index(struct ptp_clock *ptp);
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/**
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* ptp_find_pin() - obtain the pin index of a given auxiliary function
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*
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* The caller must hold ptp_clock::pincfg_mux. Drivers do not have
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* access to that mutex as ptp_clock is an opaque type. However, the
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* core code acquires the mutex before invoking the driver's
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* ptp_clock_info::enable() callback, and so drivers may call this
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* function from that context.
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*
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* @ptp: The clock obtained from ptp_clock_register().
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* @func: One of the ptp_pin_function enumerated values.
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* @chan: The particular functional channel to find.
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* Return: Pin index in the range of zero to ptp_clock_caps.n_pins - 1,
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* or -1 if the auxiliary function cannot be found.
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*/
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int ptp_find_pin(struct ptp_clock *ptp,
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enum ptp_pin_function func, unsigned int chan);
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/**
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* ptp_find_pin_unlocked() - wrapper for ptp_find_pin()
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*
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* This function acquires the ptp_clock::pincfg_mux mutex before
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* invoking ptp_find_pin(). Instead of using this function, drivers
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* should most likely call ptp_find_pin() directly from their
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* ptp_clock_info::enable() method.
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*
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*/
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int ptp_find_pin_unlocked(struct ptp_clock *ptp,
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enum ptp_pin_function func, unsigned int chan);
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/**
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* ptp_schedule_worker() - schedule ptp auxiliary work
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*
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* @ptp: The clock obtained from ptp_clock_register().
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* @delay: number of jiffies to wait before queuing
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* See kthread_queue_delayed_work() for more info.
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*/
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int ptp_schedule_worker(struct ptp_clock *ptp, unsigned long delay);
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/**
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* ptp_cancel_worker_sync() - cancel ptp auxiliary clock
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*
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* @ptp: The clock obtained from ptp_clock_register().
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*/
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void ptp_cancel_worker_sync(struct ptp_clock *ptp);
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#else
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static inline struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
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struct device *parent)
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{ return NULL; }
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static inline int ptp_clock_unregister(struct ptp_clock *ptp)
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{ return 0; }
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static inline void ptp_clock_event(struct ptp_clock *ptp,
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struct ptp_clock_event *event)
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{ }
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static inline int ptp_clock_index(struct ptp_clock *ptp)
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{ return -1; }
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static inline int ptp_find_pin(struct ptp_clock *ptp,
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enum ptp_pin_function func, unsigned int chan)
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{ return -1; }
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static inline int ptp_schedule_worker(struct ptp_clock *ptp,
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unsigned long delay)
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{ return -EOPNOTSUPP; }
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static inline void ptp_cancel_worker_sync(struct ptp_clock *ptp)
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{ }
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#endif
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static inline void ptp_read_system_prets(struct ptp_system_timestamp *sts)
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{
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if (sts)
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ktime_get_real_ts64(&sts->pre_ts);
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}
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static inline void ptp_read_system_postts(struct ptp_system_timestamp *sts)
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{
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if (sts)
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ktime_get_real_ts64(&sts->post_ts);
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}
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#endif
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