diff options
Diffstat (limited to 'drivers/ptp/ptp_private.h')
| -rw-r--r-- | drivers/ptp/ptp_private.h | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/drivers/ptp/ptp_private.h b/drivers/ptp/ptp_private.h new file mode 100644 index 0000000000..b8d4f61f14 --- /dev/null +++ b/drivers/ptp/ptp_private.h @@ -0,0 +1,146 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * PTP 1588 clock support - private declarations for the core module. + * + * Copyright (C) 2010 OMICRON electronics GmbH + */ +#ifndef _PTP_PRIVATE_H_ +#define _PTP_PRIVATE_H_ + +#include <linux/cdev.h> +#include <linux/device.h> +#include <linux/kthread.h> +#include <linux/mutex.h> +#include <linux/posix-clock.h> +#include <linux/ptp_clock.h> +#include <linux/ptp_clock_kernel.h> +#include <linux/time.h> + +#define PTP_MAX_TIMESTAMPS 128 +#define PTP_BUF_TIMESTAMPS 30 +#define PTP_DEFAULT_MAX_VCLOCKS 20 + +struct timestamp_event_queue { + struct ptp_extts_event buf[PTP_MAX_TIMESTAMPS]; + int head; + int tail; + spinlock_t lock; +}; + +struct ptp_clock { + struct posix_clock clock; + struct device dev; + struct ptp_clock_info *info; + dev_t devid; + int index; /* index into clocks.map */ + struct pps_device *pps_source; + long dialed_frequency; /* remembers the frequency adjustment */ + struct timestamp_event_queue tsevq; /* simple fifo for time stamps */ + struct mutex tsevq_mux; /* one process at a time reading the fifo */ + struct mutex pincfg_mux; /* protect concurrent info->pin_config access */ + wait_queue_head_t tsev_wq; + int defunct; /* tells readers to go away when clock is being removed */ + struct device_attribute *pin_dev_attr; + struct attribute **pin_attr; + struct attribute_group pin_attr_group; + /* 1st entry is a pointer to the real group, 2nd is NULL terminator */ + const struct attribute_group *pin_attr_groups[2]; + struct kthread_worker *kworker; + struct kthread_delayed_work aux_work; + unsigned int max_vclocks; + unsigned int n_vclocks; + int *vclock_index; + struct mutex n_vclocks_mux; /* protect concurrent n_vclocks access */ + bool is_virtual_clock; + bool has_cycles; +}; + +#define info_to_vclock(d) container_of((d), struct ptp_vclock, info) +#define cc_to_vclock(d) container_of((d), struct ptp_vclock, cc) +#define dw_to_vclock(d) container_of((d), struct ptp_vclock, refresh_work) + +struct ptp_vclock { + struct ptp_clock *pclock; + struct ptp_clock_info info; + struct ptp_clock *clock; + struct hlist_node vclock_hash_node; + struct cyclecounter cc; + struct timecounter tc; + struct mutex lock; /* protects tc/cc */ +}; + +/* + * The function queue_cnt() is safe for readers to call without + * holding q->lock. Readers use this function to verify that the queue + * is nonempty before proceeding with a dequeue operation. The fact + * that a writer might concurrently increment the tail does not + * matter, since the queue remains nonempty nonetheless. + */ +static inline int queue_cnt(const struct timestamp_event_queue *q) +{ + /* + * Paired with WRITE_ONCE() in enqueue_external_timestamp(), + * ptp_read(), extts_fifo_show(). + */ + int cnt = READ_ONCE(q->tail) - READ_ONCE(q->head); + return cnt < 0 ? PTP_MAX_TIMESTAMPS + cnt : cnt; +} + +/* Check if ptp virtual clock is in use */ +static inline bool ptp_vclock_in_use(struct ptp_clock *ptp) +{ + bool in_use = false; + + if (mutex_lock_interruptible(&ptp->n_vclocks_mux)) + return true; + + if (!ptp->is_virtual_clock && ptp->n_vclocks) + in_use = true; + + mutex_unlock(&ptp->n_vclocks_mux); + + return in_use; +} + +/* Check if ptp clock shall be free running */ +static inline bool ptp_clock_freerun(struct ptp_clock *ptp) +{ + if (ptp->has_cycles) + return false; + + return ptp_vclock_in_use(ptp); +} + +extern struct class *ptp_class; + +/* + * see ptp_chardev.c + */ + +/* caller must hold pincfg_mux */ +int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin, + enum ptp_pin_function func, unsigned int chan); + +long ptp_ioctl(struct posix_clock *pc, + unsigned int cmd, unsigned long arg); + +int ptp_open(struct posix_clock *pc, fmode_t fmode); + +ssize_t ptp_read(struct posix_clock *pc, + uint flags, char __user *buf, size_t cnt); + +__poll_t ptp_poll(struct posix_clock *pc, + struct file *fp, poll_table *wait); + +/* + * see ptp_sysfs.c + */ + +extern const struct attribute_group *ptp_groups[]; + +int ptp_populate_pin_groups(struct ptp_clock *ptp); +void ptp_cleanup_pin_groups(struct ptp_clock *ptp); + +struct ptp_vclock *ptp_vclock_register(struct ptp_clock *pclock); +void ptp_vclock_unregister(struct ptp_vclock *vclock); +#endif |