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
12 struct 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
29 struct cavium_ptp *cavium_ptp_get(void);
30 void cavium_ptp_put(struct cavium_ptp *ptp);
31
cavium_ptp_tstamp2time(struct cavium_ptp * ptp,u64 tstamp)32 static 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
cavium_ptp_clock_index(struct cavium_ptp * clock)44 static inline int cavium_ptp_clock_index(struct cavium_ptp *clock)
45 {
46 return ptp_clock_index(clock->ptp_clock);
47 }
48
49 #else
50
cavium_ptp_get(void)51 static inline struct cavium_ptp *cavium_ptp_get(void)
52 {
53 return ERR_PTR(-ENODEV);
54 }
55
cavium_ptp_put(struct cavium_ptp * ptp)56 static inline void cavium_ptp_put(struct cavium_ptp *ptp) {}
57
cavium_ptp_tstamp2time(struct cavium_ptp * ptp,u64 tstamp)58 static inline u64 cavium_ptp_tstamp2time(struct cavium_ptp *ptp, u64 tstamp)
59 {
60 return 0;
61 }
62
cavium_ptp_clock_index(struct cavium_ptp * clock)63 static inline int cavium_ptp_clock_index(struct cavium_ptp *clock)
64 {
65 return -1;
66 }
67
68 #endif
69
70 #endif
71