1/* SPDX-License-Identifier: GPL-2.0 */
2/* cavium_ptp.h - PTP 1588 clock on Cavium hardware
3 * Copyright (c) 2003-2015, 2017 Cavium, Inc.
4 */
5
6#ifndef CAVIUM_PTP_H
7#define CAVIUM_PTP_H
8
9#include <linux/ptp_clock_kernel.h>
10#include <linux/timecounter.h>
11
12struct cavium_ptp {
13	struct pci_dev *pdev;
14
15	/* Serialize access to cycle_counter, time_counter and hw_registers */
16	spinlock_t spin_lock;
17	struct cyclecounter cycle_counter;
18	struct timecounter time_counter;
19	void __iomem *reg_base;
20
21	u32 clock_rate;
22
23	struct ptp_clock_info ptp_info;
24	struct ptp_clock *ptp_clock;
25};
26
27#if IS_REACHABLE(CONFIG_CAVIUM_PTP)
28
29struct cavium_ptp *cavium_ptp_get(void);
30void cavium_ptp_put(struct cavium_ptp *ptp);
31
32static inline u64 cavium_ptp_tstamp2time(struct cavium_ptp *ptp, u64 tstamp)
33{
34	unsigned long flags;
35	u64 ret;
36
37	spin_lock_irqsave(&ptp->spin_lock, flags);
38	ret = timecounter_cyc2time(&ptp->time_counter, tstamp);
39	spin_unlock_irqrestore(&ptp->spin_lock, flags);
40
41	return ret;
42}
43
44static inline int cavium_ptp_clock_index(struct cavium_ptp *clock)
45{
46	return ptp_clock_index(clock->ptp_clock);
47}
48
49#else
50
51static inline struct cavium_ptp *cavium_ptp_get(void)
52{
53	return ERR_PTR(-ENODEV);
54}
55
56static inline void cavium_ptp_put(struct cavium_ptp *ptp) {}
57
58static inline u64 cavium_ptp_tstamp2time(struct cavium_ptp *ptp, u64 tstamp)
59{
60	return 0;
61}
62
63static inline int cavium_ptp_clock_index(struct cavium_ptp *clock)
64{
65	return -1;
66}
67
68#endif
69
70#endif
71