2 * Copyright 2012 Red Hat Inc.
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
27 nvkm_timer_read(struct nvkm_timer *tmr)
29 return tmr->func->read(tmr);
33 nvkm_timer_alarm_trigger(struct nvkm_timer *tmr)
35 struct nvkm_alarm *alarm, *atemp;
39 /* move any due alarms off the pending list */
40 spin_lock_irqsave(&tmr->lock, flags);
41 list_for_each_entry_safe(alarm, atemp, &tmr->alarms, head) {
42 if (alarm->timestamp <= nvkm_timer_read(tmr))
43 list_move_tail(&alarm->head, &exec);
46 /* reschedule interrupt for next alarm time */
47 if (!list_empty(&tmr->alarms)) {
48 alarm = list_first_entry(&tmr->alarms, typeof(*alarm), head);
49 tmr->func->alarm_init(tmr, alarm->timestamp);
51 tmr->func->alarm_fini(tmr);
53 spin_unlock_irqrestore(&tmr->lock, flags);
55 /* execute any pending alarm handlers */
56 list_for_each_entry_safe(alarm, atemp, &exec, head) {
57 list_del_init(&alarm->head);
63 nvkm_timer_alarm(struct nvkm_timer *tmr, u32 nsec, struct nvkm_alarm *alarm)
65 struct nvkm_alarm *list;
68 alarm->timestamp = nvkm_timer_read(tmr) + nsec;
70 /* append new alarm to list, in soonest-alarm-first order */
71 spin_lock_irqsave(&tmr->lock, flags);
73 if (!list_empty(&alarm->head))
74 list_del(&alarm->head);
76 list_for_each_entry(list, &tmr->alarms, head) {
77 if (list->timestamp > alarm->timestamp)
80 list_add_tail(&alarm->head, &list->head);
82 spin_unlock_irqrestore(&tmr->lock, flags);
84 /* process pending alarms */
85 nvkm_timer_alarm_trigger(tmr);
89 nvkm_timer_alarm_cancel(struct nvkm_timer *tmr, struct nvkm_alarm *alarm)
92 spin_lock_irqsave(&tmr->lock, flags);
93 list_del_init(&alarm->head);
94 spin_unlock_irqrestore(&tmr->lock, flags);
98 nvkm_timer_intr(struct nvkm_subdev *subdev)
100 struct nvkm_timer *tmr = nvkm_timer(subdev);
101 tmr->func->intr(tmr);
105 nvkm_timer_fini(struct nvkm_subdev *subdev, bool suspend)
107 struct nvkm_timer *tmr = nvkm_timer(subdev);
108 tmr->func->alarm_fini(tmr);
113 nvkm_timer_init(struct nvkm_subdev *subdev)
115 struct nvkm_timer *tmr = nvkm_timer(subdev);
117 tmr->func->init(tmr);
118 tmr->func->time(tmr, ktime_to_ns(ktime_get()));
119 nvkm_timer_alarm_trigger(tmr);
124 nvkm_timer_dtor(struct nvkm_subdev *subdev)
126 return nvkm_timer(subdev);
129 static const struct nvkm_subdev_func
131 .dtor = nvkm_timer_dtor,
132 .init = nvkm_timer_init,
133 .fini = nvkm_timer_fini,
134 .intr = nvkm_timer_intr,
138 nvkm_timer_new_(const struct nvkm_timer_func *func, struct nvkm_device *device,
139 int index, struct nvkm_timer **ptmr)
141 struct nvkm_timer *tmr;
143 if (!(tmr = *ptmr = kzalloc(sizeof(*tmr), GFP_KERNEL)))
146 nvkm_subdev_ctor(&nvkm_timer, device, index, &tmr->subdev);
148 INIT_LIST_HEAD(&tmr->alarms);
149 spin_lock_init(&tmr->lock);