cavium/common/cavium_ptp.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /* cavium_ptp.h - PTP 1588 clock on Cavium hardware
0003  * Copyright (c) 2003-2015, 2017 Cavium, Inc.
0004  */
0005
0006 #ifndef CAVIUM_PTP_H
0007 #define CAVIUM_PTP_H
0008
0009 #include <linux/ptp_clock_kernel.h>
0010 #include <linux/timecounter.h>
0011
0012 struct cavium_ptp {
0013     struct pci_dev *pdev;
0014
0015     /* Serialize access to cycle_counter, time_counter and hw_registers */
0016     spinlock_t spin_lock;
0017     struct cyclecounter cycle_counter;
0018     struct timecounter time_counter;
0019     void __iomem *reg_base;
0020
0021     u32 clock_rate;
0022
0023     struct ptp_clock_info ptp_info;
0024     struct ptp_clock *ptp_clock;
0025 };
0026
0027 #if IS_REACHABLE(CONFIG_CAVIUM_PTP)
0028
0029 struct cavium_ptp *cavium_ptp_get(void);
0030 void cavium_ptp_put(struct cavium_ptp *ptp);
0031
0032 static inline u64 cavium_ptp_tstamp2time(struct cavium_ptp *ptp, u64 tstamp)
0033 {
0034     unsigned long flags;
0035     u64 ret;
0036
0037     spin_lock_irqsave(&ptp->spin_lock, flags);
0038     ret = timecounter_cyc2time(&ptp->time_counter, tstamp);
0039     spin_unlock_irqrestore(&ptp->spin_lock, flags);
0040
0041     return ret;
0042 }
0043
0044 static inline int cavium_ptp_clock_index(struct cavium_ptp *clock)
0045 {
0046     return ptp_clock_index(clock->ptp_clock);
0047 }
0048
0049 #else
0050
0051 static inline struct cavium_ptp *cavium_ptp_get(void)
0052 {
0053     return ERR_PTR(-ENODEV);
0054 }
0055
0056 static inline void cavium_ptp_put(struct cavium_ptp *ptp) {}
0057
0058 static inline u64 cavium_ptp_tstamp2time(struct cavium_ptp *ptp, u64 tstamp)
0059 {
0060     return 0;
0061 }
0062
0063 static inline int cavium_ptp_clock_index(struct cavium_ptp *clock)
0064 {
0065     return -1;
0066 }
0067
0068 #endif
0069
0070 #endif