136 lines
3.8 KiB
C
136 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* PTP 1588 clock support - private declarations for the core module.
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*
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* Copyright (C) 2010 OMICRON electronics GmbH
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*/
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#ifndef _PTP_PRIVATE_H_
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#define _PTP_PRIVATE_H_
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#include <linux/cdev.h>
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#include <linux/device.h>
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#include <linux/kthread.h>
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#include <linux/mutex.h>
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#include <linux/posix-clock.h>
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#include <linux/ptp_clock.h>
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#include <linux/ptp_clock_kernel.h>
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#include <linux/time.h>
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#define PTP_MAX_TIMESTAMPS 128
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#define PTP_BUF_TIMESTAMPS 30
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#define PTP_DEFAULT_MAX_VCLOCKS 20
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struct timestamp_event_queue {
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struct ptp_extts_event buf[PTP_MAX_TIMESTAMPS];
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int head;
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int tail;
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spinlock_t lock;
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};
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struct ptp_clock {
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struct posix_clock clock;
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struct device dev;
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struct ptp_clock_info *info;
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dev_t devid;
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int index; /* index into clocks.map */
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struct pps_device *pps_source;
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long dialed_frequency; /* remembers the frequency adjustment */
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struct timestamp_event_queue tsevq; /* simple fifo for time stamps */
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struct mutex tsevq_mux; /* one process at a time reading the fifo */
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struct mutex pincfg_mux; /* protect concurrent info->pin_config access */
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wait_queue_head_t tsev_wq;
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int defunct; /* tells readers to go away when clock is being removed */
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struct device_attribute *pin_dev_attr;
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struct attribute **pin_attr;
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struct attribute_group pin_attr_group;
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/* 1st entry is a pointer to the real group, 2nd is NULL terminator */
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const struct attribute_group *pin_attr_groups[2];
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struct kthread_worker *kworker;
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struct kthread_delayed_work aux_work;
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unsigned int max_vclocks;
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unsigned int n_vclocks;
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int *vclock_index;
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struct mutex n_vclocks_mux; /* protect concurrent n_vclocks access */
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bool is_virtual_clock;
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};
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#define info_to_vclock(d) container_of((d), struct ptp_vclock, info)
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#define cc_to_vclock(d) container_of((d), struct ptp_vclock, cc)
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#define dw_to_vclock(d) container_of((d), struct ptp_vclock, refresh_work)
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struct ptp_vclock {
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struct ptp_clock *pclock;
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struct ptp_clock_info info;
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struct ptp_clock *clock;
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struct cyclecounter cc;
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struct timecounter tc;
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spinlock_t lock; /* protects tc/cc */
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};
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/*
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* The function queue_cnt() is safe for readers to call without
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* holding q->lock. Readers use this function to verify that the queue
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* is nonempty before proceeding with a dequeue operation. The fact
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* that a writer might concurrently increment the tail does not
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* matter, since the queue remains nonempty nonetheless.
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*/
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static inline int queue_cnt(const struct timestamp_event_queue *q)
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{
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/*
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* Paired with WRITE_ONCE() in enqueue_external_timestamp(),
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* ptp_read(), extts_fifo_show().
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*/
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int cnt = READ_ONCE(q->tail) - READ_ONCE(q->head);
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return cnt < 0 ? PTP_MAX_TIMESTAMPS + cnt : cnt;
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}
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/* Check if ptp virtual clock is in use */
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static inline bool ptp_vclock_in_use(struct ptp_clock *ptp)
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{
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bool in_use = false;
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if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
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return true;
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if (!ptp->is_virtual_clock && ptp->n_vclocks)
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in_use = true;
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mutex_unlock(&ptp->n_vclocks_mux);
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return in_use;
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}
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extern struct class *ptp_class;
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/*
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* see ptp_chardev.c
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*/
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/* caller must hold pincfg_mux */
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int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin,
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enum ptp_pin_function func, unsigned int chan);
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long ptp_ioctl(struct posix_clock *pc,
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unsigned int cmd, unsigned long arg);
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int ptp_open(struct posix_clock *pc, fmode_t fmode);
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ssize_t ptp_read(struct posix_clock *pc,
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uint flags, char __user *buf, size_t cnt);
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__poll_t ptp_poll(struct posix_clock *pc,
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struct file *fp, poll_table *wait);
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/*
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* see ptp_sysfs.c
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*/
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extern const struct attribute_group *ptp_groups[];
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int ptp_populate_pin_groups(struct ptp_clock *ptp);
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void ptp_cleanup_pin_groups(struct ptp_clock *ptp);
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struct ptp_vclock *ptp_vclock_register(struct ptp_clock *pclock);
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void ptp_vclock_unregister(struct ptp_vclock *vclock);
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#endif
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