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(&ptp->time_counter, tstamp); 39 spin_unlock_irqrestore(&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(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