| 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 | |
| 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(tc: &ptp->time_counter, cycle_tstamp: tstamp); |
| 39 | spin_unlock_irqrestore(lock: &ptp->spin_lock, flags); |
| 40 | |
| 41 | return ret; |
| 42 | } |
| 43 | |
| 44 | static inline int cavium_ptp_clock_index(struct cavium_ptp *clock) |
| 45 | { |
| 46 | return ptp_clock_index(ptp: clock->ptp_clock); |
| 47 | } |
| 48 | |
| 49 | #else |
| 50 | |
| 51 | static inline struct cavium_ptp *cavium_ptp_get(void) |
| 52 | { |
| 53 | return ERR_PTR(-ENODEV); |
| 54 | } |
| 55 | |
| 56 | static inline void cavium_ptp_put(struct cavium_ptp *ptp) {} |
| 57 | |
| 58 | static inline u64 cavium_ptp_tstamp2time(struct cavium_ptp *ptp, u64 tstamp) |
| 59 | { |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | static inline int cavium_ptp_clock_index(struct cavium_ptp *clock) |
| 64 | { |
| 65 | return -1; |
| 66 | } |
| 67 | |
| 68 | #endif |
| 69 | |
| 70 | #endif |
| 71 |