// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright 2023 NXP * * Mock-up PTP Hardware Clock driver for virtual network devices * * Create a PTP clock which offers PTP time manipulation operations * using a timecounter/cyclecounter on top of CLOCK_MONOTONIC_RAW. */ #include <linux/ptp_clock_kernel.h> #include <linux/ptp_mock.h> #include <linux/timecounter.h> /* Clamp scaled_ppm between -2,097,152,000 and 2,097,152,000, * and thus "adj" between -68,719,476 and 68,719,476 */ #define MOCK_PHC_MAX_ADJ_PPB … /* Timestamps from ktime_get_raw() have 1 ns resolution, so the scale factor * (MULT >> SHIFT) needs to be 1. Pick SHIFT as 31 bits, which translates * MULT(freq 0) into 0x80000000. */ #define MOCK_PHC_CC_SHIFT … #define MOCK_PHC_CC_MULT … #define MOCK_PHC_FADJ_SHIFT … #define MOCK_PHC_FADJ_DENOMINATOR … /* The largest cycle_delta that timecounter_read_delta() can handle without a * 64-bit overflow during the multiplication with cc->mult, given the max "adj" * we permit, is ~8.3 seconds. Make sure readouts are more frequent than that. */ #define MOCK_PHC_REFRESH_INTERVAL … #define info_to_phc(d) … struct mock_phc { … }; static u64 mock_phc_cc_read(const struct cyclecounter *cc) { … } static int mock_phc_adjfine(struct ptp_clock_info *info, long scaled_ppm) { … } static int mock_phc_adjtime(struct ptp_clock_info *info, s64 delta) { … } static int mock_phc_settime64(struct ptp_clock_info *info, const struct timespec64 *ts) { … } static int mock_phc_gettime64(struct ptp_clock_info *info, struct timespec64 *ts) { … } static long mock_phc_refresh(struct ptp_clock_info *info) { … } int mock_phc_index(struct mock_phc *phc) { … } EXPORT_SYMBOL_GPL(…); struct mock_phc *mock_phc_create(struct device *dev) { … } EXPORT_SYMBOL_GPL(…); void mock_phc_destroy(struct mock_phc *phc) { … } EXPORT_SYMBOL_GPL(…); MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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