1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
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>
#include <linux/list.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 list_head qlist;
};
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 list_head tsevqs; /* timestamp fifo list */
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(struct timestamp_event_queue *q)
{
int cnt = q->tail - 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_context *pccontext, unsigned int cmd,
unsigned long arg);
int ptp_open(struct posix_clock_context *pccontext, fmode_t fmode);
int ptp_release(struct posix_clock_context *pccontext);
ssize_t ptp_read(struct posix_clock_context *pccontext, uint flags, char __user *buf,
size_t cnt);
__poll_t ptp_poll(struct posix_clock_context *pccontext, 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
|