1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * Mock-up PTP Hardware Clock driver for virtual network devices
15 /* Clamp scaled_ppm between -2,097,152,000 and 2,097,152,000,
16  * and thus "adj" between -68,719,476 and 68,719,476
29  * 64-bit overflow during the multiplication with cc->mult, given the max "adj"
52 	s64 adj;  in mock_phc_adjfine()  local
54 	adj = (s64)scaled_ppm << MOCK_PHC_FADJ_SHIFT;  in mock_phc_adjfine()
55 	adj = div_s64(adj, MOCK_PHC_FADJ_DENOMINATOR);  in mock_phc_adjfine()
57 	spin_lock(&phc->lock);  in mock_phc_adjfine()
58 	timecounter_read(&phc->tc);  in mock_phc_adjfine()
59 	phc->cc.mult = MOCK_PHC_CC_MULT + adj;  in mock_phc_adjfine()
60 	spin_unlock(&phc->lock);  in mock_phc_adjfine()
69 	spin_lock(&phc->lock);  in mock_phc_adjtime()
70 	timecounter_adjtime(&phc->tc, delta);  in mock_phc_adjtime()
71 	spin_unlock(&phc->lock);  in mock_phc_adjtime()
82 	spin_lock(&phc->lock);  in mock_phc_settime64()
83 	timecounter_init(&phc->tc, &phc->cc, ns);  in mock_phc_settime64()
84 	spin_unlock(&phc->lock);  in mock_phc_settime64()
94 	spin_lock(&phc->lock);  in mock_phc_gettime64()
95 	ns = timecounter_read(&phc->tc);  in mock_phc_gettime64()
96 	spin_unlock(&phc->lock);  in mock_phc_gettime64()
114 	return ptp_clock_index(phc->clock);  in mock_phc_index()
125 		err = -ENOMEM;  in mock_phc_create()
129 	phc->info = (struct ptp_clock_info) {  in mock_phc_create()
131 		.name		= "Mock-up PTP clock",  in mock_phc_create()
140 	phc->cc = (struct cyclecounter) {  in mock_phc_create()
147 	spin_lock_init(&phc->lock);  in mock_phc_create()
148 	timecounter_init(&phc->tc, &phc->cc, 0);  in mock_phc_create()
150 	phc->clock = ptp_clock_register(&phc->info, dev);  in mock_phc_create()
151 	if (IS_ERR(phc->clock)) {  in mock_phc_create()
152 		err = PTR_ERR(phc->clock);  in mock_phc_create()
156 	ptp_schedule_worker(phc->clock, MOCK_PHC_REFRESH_INTERVAL);  in mock_phc_create()
169 	ptp_clock_unregister(phc->clock);  in mock_phc_destroy()
174 MODULE_DESCRIPTION("Mock-up PTP Hardware Clock driver");