71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* cavium_ptp.h - PTP 1588 clock on Cavium hardware
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* Copyright (c) 2003-2015, 2017 Cavium, Inc.
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*/
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#ifndef CAVIUM_PTP_H
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#define CAVIUM_PTP_H
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#include <linux/ptp_clock_kernel.h>
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#include <linux/timecounter.h>
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struct cavium_ptp {
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struct pci_dev *pdev;
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/* Serialize access to cycle_counter, time_counter and hw_registers */
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spinlock_t spin_lock;
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struct cyclecounter cycle_counter;
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struct timecounter time_counter;
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void __iomem *reg_base;
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u32 clock_rate;
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struct ptp_clock_info ptp_info;
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struct ptp_clock *ptp_clock;
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};
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#if IS_REACHABLE(CONFIG_CAVIUM_PTP)
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struct cavium_ptp *cavium_ptp_get(void);
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void cavium_ptp_put(struct cavium_ptp *ptp);
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static inline u64 cavium_ptp_tstamp2time(struct cavium_ptp *ptp, u64 tstamp)
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{
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unsigned long flags;
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u64 ret;
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spin_lock_irqsave(&ptp->spin_lock, flags);
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ret = timecounter_cyc2time(&ptp->time_counter, tstamp);
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spin_unlock_irqrestore(&ptp->spin_lock, flags);
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return ret;
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}
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static inline int cavium_ptp_clock_index(struct cavium_ptp *clock)
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{
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return ptp_clock_index(clock->ptp_clock);
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}
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#else
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static inline struct cavium_ptp *cavium_ptp_get(void)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline void cavium_ptp_put(struct cavium_ptp *ptp) {}
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static inline u64 cavium_ptp_tstamp2time(struct cavium_ptp *ptp, u64 tstamp)
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{
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return 0;
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}
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static inline int cavium_ptp_clock_index(struct cavium_ptp *clock)
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{
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return -1;
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}
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#endif
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#endif
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