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5d43f951 YL |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * PTP virtual clock driver | |
4 | * | |
5 | * Copyright 2021 NXP | |
6 | */ | |
7 | #include <linux/slab.h> | |
8 | #include "ptp_private.h" | |
9 | ||
10 | #define PTP_VCLOCK_CC_SHIFT 31 | |
11 | #define PTP_VCLOCK_CC_MULT (1 << PTP_VCLOCK_CC_SHIFT) | |
12 | #define PTP_VCLOCK_FADJ_SHIFT 9 | |
13 | #define PTP_VCLOCK_FADJ_DENOMINATOR 15625ULL | |
14 | #define PTP_VCLOCK_REFRESH_INTERVAL (HZ * 2) | |
15 | ||
16 | static int ptp_vclock_adjfine(struct ptp_clock_info *ptp, long scaled_ppm) | |
17 | { | |
18 | struct ptp_vclock *vclock = info_to_vclock(ptp); | |
19 | unsigned long flags; | |
20 | s64 adj; | |
21 | ||
22 | adj = (s64)scaled_ppm << PTP_VCLOCK_FADJ_SHIFT; | |
23 | adj = div_s64(adj, PTP_VCLOCK_FADJ_DENOMINATOR); | |
24 | ||
25 | spin_lock_irqsave(&vclock->lock, flags); | |
26 | timecounter_read(&vclock->tc); | |
27 | vclock->cc.mult = PTP_VCLOCK_CC_MULT + adj; | |
28 | spin_unlock_irqrestore(&vclock->lock, flags); | |
29 | ||
30 | return 0; | |
31 | } | |
32 | ||
33 | static int ptp_vclock_adjtime(struct ptp_clock_info *ptp, s64 delta) | |
34 | { | |
35 | struct ptp_vclock *vclock = info_to_vclock(ptp); | |
36 | unsigned long flags; | |
37 | ||
38 | spin_lock_irqsave(&vclock->lock, flags); | |
39 | timecounter_adjtime(&vclock->tc, delta); | |
40 | spin_unlock_irqrestore(&vclock->lock, flags); | |
41 | ||
42 | return 0; | |
43 | } | |
44 | ||
45 | static int ptp_vclock_gettime(struct ptp_clock_info *ptp, | |
46 | struct timespec64 *ts) | |
47 | { | |
48 | struct ptp_vclock *vclock = info_to_vclock(ptp); | |
49 | unsigned long flags; | |
50 | u64 ns; | |
51 | ||
52 | spin_lock_irqsave(&vclock->lock, flags); | |
53 | ns = timecounter_read(&vclock->tc); | |
54 | spin_unlock_irqrestore(&vclock->lock, flags); | |
55 | *ts = ns_to_timespec64(ns); | |
56 | ||
57 | return 0; | |
58 | } | |
59 | ||
60 | static int ptp_vclock_settime(struct ptp_clock_info *ptp, | |
61 | const struct timespec64 *ts) | |
62 | { | |
63 | struct ptp_vclock *vclock = info_to_vclock(ptp); | |
64 | u64 ns = timespec64_to_ns(ts); | |
65 | unsigned long flags; | |
66 | ||
67 | spin_lock_irqsave(&vclock->lock, flags); | |
68 | timecounter_init(&vclock->tc, &vclock->cc, ns); | |
69 | spin_unlock_irqrestore(&vclock->lock, flags); | |
70 | ||
71 | return 0; | |
72 | } | |
73 | ||
74 | static long ptp_vclock_refresh(struct ptp_clock_info *ptp) | |
75 | { | |
76 | struct ptp_vclock *vclock = info_to_vclock(ptp); | |
77 | struct timespec64 ts; | |
78 | ||
79 | ptp_vclock_gettime(&vclock->info, &ts); | |
80 | ||
81 | return PTP_VCLOCK_REFRESH_INTERVAL; | |
82 | } | |
83 | ||
84 | static const struct ptp_clock_info ptp_vclock_info = { | |
85 | .owner = THIS_MODULE, | |
86 | .name = "ptp virtual clock", | |
87 | /* The maximum ppb value that long scaled_ppm can support */ | |
88 | .max_adj = 32767999, | |
89 | .adjfine = ptp_vclock_adjfine, | |
90 | .adjtime = ptp_vclock_adjtime, | |
91 | .gettime64 = ptp_vclock_gettime, | |
92 | .settime64 = ptp_vclock_settime, | |
93 | .do_aux_work = ptp_vclock_refresh, | |
94 | }; | |
95 | ||
96 | static u64 ptp_vclock_read(const struct cyclecounter *cc) | |
97 | { | |
98 | struct ptp_vclock *vclock = cc_to_vclock(cc); | |
99 | struct ptp_clock *ptp = vclock->pclock; | |
100 | struct timespec64 ts = {}; | |
101 | ||
102 | if (ptp->info->gettimex64) | |
103 | ptp->info->gettimex64(ptp->info, &ts, NULL); | |
104 | else | |
105 | ptp->info->gettime64(ptp->info, &ts); | |
106 | ||
107 | return timespec64_to_ns(&ts); | |
108 | } | |
109 | ||
110 | static const struct cyclecounter ptp_vclock_cc = { | |
111 | .read = ptp_vclock_read, | |
112 | .mask = CYCLECOUNTER_MASK(32), | |
113 | .mult = PTP_VCLOCK_CC_MULT, | |
114 | .shift = PTP_VCLOCK_CC_SHIFT, | |
115 | }; | |
116 | ||
117 | struct ptp_vclock *ptp_vclock_register(struct ptp_clock *pclock) | |
118 | { | |
119 | struct ptp_vclock *vclock; | |
120 | ||
121 | vclock = kzalloc(sizeof(*vclock), GFP_KERNEL); | |
122 | if (!vclock) | |
123 | return NULL; | |
124 | ||
125 | vclock->pclock = pclock; | |
126 | vclock->info = ptp_vclock_info; | |
127 | vclock->cc = ptp_vclock_cc; | |
128 | ||
129 | snprintf(vclock->info.name, PTP_CLOCK_NAME_LEN, "ptp%d_virt", | |
130 | pclock->index); | |
131 | ||
132 | spin_lock_init(&vclock->lock); | |
133 | ||
134 | vclock->clock = ptp_clock_register(&vclock->info, &pclock->dev); | |
135 | if (IS_ERR_OR_NULL(vclock->clock)) { | |
136 | kfree(vclock); | |
137 | return NULL; | |
138 | } | |
139 | ||
140 | timecounter_init(&vclock->tc, &vclock->cc, 0); | |
141 | ptp_schedule_worker(vclock->clock, PTP_VCLOCK_REFRESH_INTERVAL); | |
142 | ||
143 | return vclock; | |
144 | } | |
145 | ||
146 | void ptp_vclock_unregister(struct ptp_vclock *vclock) | |
147 | { | |
148 | ptp_clock_unregister(vclock->clock); | |
149 | kfree(vclock); | |
150 | } | |
acb288e8 | 151 | |
e5f31552 | 152 | #if IS_BUILTIN(CONFIG_PTP_1588_CLOCK) |
acb288e8 YL |
153 | int ptp_get_vclocks_index(int pclock_index, int **vclock_index) |
154 | { | |
155 | char name[PTP_CLOCK_NAME_LEN] = ""; | |
156 | struct ptp_clock *ptp; | |
157 | struct device *dev; | |
158 | int num = 0; | |
159 | ||
160 | if (pclock_index < 0) | |
161 | return num; | |
162 | ||
163 | snprintf(name, PTP_CLOCK_NAME_LEN, "ptp%d", pclock_index); | |
164 | dev = class_find_device_by_name(ptp_class, name); | |
165 | if (!dev) | |
166 | return num; | |
167 | ||
168 | ptp = dev_get_drvdata(dev); | |
169 | ||
170 | if (mutex_lock_interruptible(&ptp->n_vclocks_mux)) { | |
171 | put_device(dev); | |
172 | return num; | |
173 | } | |
174 | ||
175 | *vclock_index = kzalloc(sizeof(int) * ptp->n_vclocks, GFP_KERNEL); | |
176 | if (!(*vclock_index)) | |
177 | goto out; | |
178 | ||
179 | memcpy(*vclock_index, ptp->vclock_index, sizeof(int) * ptp->n_vclocks); | |
180 | num = ptp->n_vclocks; | |
181 | out: | |
182 | mutex_unlock(&ptp->n_vclocks_mux); | |
183 | put_device(dev); | |
184 | return num; | |
185 | } | |
186 | EXPORT_SYMBOL(ptp_get_vclocks_index); | |
895487a3 | 187 | |
9f7d49f8 ML |
188 | ktime_t ptp_convert_timestamp(const struct skb_shared_hwtstamps *hwtstamps, |
189 | int vclock_index) | |
895487a3 YL |
190 | { |
191 | char name[PTP_CLOCK_NAME_LEN] = ""; | |
192 | struct ptp_vclock *vclock; | |
193 | struct ptp_clock *ptp; | |
194 | unsigned long flags; | |
195 | struct device *dev; | |
196 | u64 ns; | |
197 | ||
198 | snprintf(name, PTP_CLOCK_NAME_LEN, "ptp%d", vclock_index); | |
199 | dev = class_find_device_by_name(ptp_class, name); | |
200 | if (!dev) | |
9f7d49f8 | 201 | return 0; |
895487a3 YL |
202 | |
203 | ptp = dev_get_drvdata(dev); | |
204 | if (!ptp->is_virtual_clock) { | |
205 | put_device(dev); | |
9f7d49f8 | 206 | return 0; |
895487a3 YL |
207 | } |
208 | ||
209 | vclock = info_to_vclock(ptp->info); | |
210 | ||
211 | ns = ktime_to_ns(hwtstamps->hwtstamp); | |
212 | ||
213 | spin_lock_irqsave(&vclock->lock, flags); | |
214 | ns = timecounter_cyc2time(&vclock->tc, ns); | |
215 | spin_unlock_irqrestore(&vclock->lock, flags); | |
216 | ||
217 | put_device(dev); | |
9f7d49f8 | 218 | return ns_to_ktime(ns); |
895487a3 YL |
219 | } |
220 | EXPORT_SYMBOL(ptp_convert_timestamp); | |
e5f31552 | 221 | #endif |