drivers/net/ethernet/cavium/common/cavium_ptp.h

   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_ENABLED(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